blob: bc081850ac0e5538241bd1cab37b65aeefd2c244 [file] [log] [blame]
Johannes Berg571ecf62007-07-27 15:43:22 +02001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Johannes Berg84040802010-02-15 12:46:39 +02005 * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergd98ad832014-09-03 15:24:57 +03006 * Copyright 2013-2014 Intel Mobile Communications GmbH
Johannes Berg571ecf62007-07-27 15:43:22 +02007 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
S.Çağlar Onurab466232008-02-14 17:36:47 +020013#include <linux/jiffies.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020015#include <linux/kernel.h>
16#include <linux/skbuff.h>
17#include <linux/netdevice.h>
18#include <linux/etherdevice.h>
Johannes Bergd4e46a32007-09-14 11:10:24 -040019#include <linux/rcupdate.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040020#include <linux/export.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020021#include <net/mac80211.h>
22#include <net/ieee80211_radiotap.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010023#include <asm/unaligned.h>
Johannes Berg571ecf62007-07-27 15:43:22 +020024
25#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020026#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040027#include "led.h"
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +010028#include "mesh.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020029#include "wep.h"
30#include "wpa.h"
31#include "tkip.h"
32#include "wme.h"
Johannes Berg1d8d3de2011-12-16 15:28:57 +010033#include "rate.h"
Johannes Berg571ecf62007-07-27 15:43:22 +020034
Johannes Berg5a490512015-04-22 17:10:38 +020035static inline void ieee80211_rx_stats(struct net_device *dev, u32 len)
36{
37 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
38
39 u64_stats_update_begin(&tstats->syncp);
40 tstats->rx_packets++;
41 tstats->rx_bytes += len;
42 u64_stats_update_end(&tstats->syncp);
43}
44
Johannes Berga6828492015-06-16 15:17:15 +020045static u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
46 enum nl80211_iftype type)
47{
48 __le16 fc = hdr->frame_control;
49
50 if (ieee80211_is_data(fc)) {
51 if (len < 24) /* drop incorrect hdr len (data) */
52 return NULL;
53
54 if (ieee80211_has_a4(fc))
55 return NULL;
56 if (ieee80211_has_tods(fc))
57 return hdr->addr1;
58 if (ieee80211_has_fromds(fc))
59 return hdr->addr2;
60
61 return hdr->addr3;
62 }
63
64 if (ieee80211_is_mgmt(fc)) {
65 if (len < 24) /* drop incorrect hdr len (mgmt) */
66 return NULL;
67 return hdr->addr3;
68 }
69
70 if (ieee80211_is_ctl(fc)) {
71 if (ieee80211_is_pspoll(fc))
72 return hdr->addr1;
73
74 if (ieee80211_is_back_req(fc)) {
75 switch (type) {
76 case NL80211_IFTYPE_STATION:
77 return hdr->addr2;
78 case NL80211_IFTYPE_AP:
79 case NL80211_IFTYPE_AP_VLAN:
80 return hdr->addr1;
81 default:
82 break; /* fall through to the return */
83 }
84 }
85 }
86
87 return NULL;
88}
89
Johannes Bergb2e77712007-09-26 15:19:39 +020090/*
91 * monitor mode reception
92 *
93 * This function cleans up the SKB, i.e. it removes all the stuff
94 * only useful for monitoring.
95 */
96static struct sk_buff *remove_monitor_info(struct ieee80211_local *local,
Johannes Berg1f7bba72014-11-06 22:56:36 +010097 struct sk_buff *skb,
98 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +020099{
Johannes Berg30686bf2015-06-02 21:39:54 +0200100 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200101 if (likely(skb->len > FCS_LEN))
Zhu Yie3cf8b32010-03-29 17:35:07 +0800102 __pskb_trim(skb, skb->len - FCS_LEN);
Johannes Bergb2e77712007-09-26 15:19:39 +0200103 else {
104 /* driver bug */
105 WARN_ON(1);
106 dev_kfree_skb(skb);
Dan Carpenter06247602012-11-27 20:31:19 +0300107 return NULL;
Johannes Bergb2e77712007-09-26 15:19:39 +0200108 }
109 }
110
Johannes Berg1f7bba72014-11-06 22:56:36 +0100111 __pskb_pull(skb, rtap_vendor_space);
112
Johannes Bergb2e77712007-09-26 15:19:39 +0200113 return skb;
114}
115
Johannes Berg1f7bba72014-11-06 22:56:36 +0100116static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len,
117 unsigned int rtap_vendor_space)
Johannes Bergb2e77712007-09-26 15:19:39 +0200118{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200119 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100120 struct ieee80211_hdr *hdr;
121
122 hdr = (void *)(skb->data + rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200123
Johannes Berg4c298672012-07-05 11:34:31 +0200124 if (status->flag & (RX_FLAG_FAILED_FCS_CRC |
Johannes Berg0c028b52015-06-12 14:33:54 +0200125 RX_FLAG_FAILED_PLCP_CRC))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800126 return true;
127
Johannes Berg1f7bba72014-11-06 22:56:36 +0100128 if (unlikely(skb->len < 16 + present_fcs_len + rtap_vendor_space))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800129 return true;
130
Harvey Harrison87228f52008-06-11 14:21:59 -0700131 if (ieee80211_is_ctl(hdr->frame_control) &&
132 !ieee80211_is_pspoll(hdr->frame_control) &&
133 !ieee80211_is_back_req(hdr->frame_control))
Zhao, Gang6b59db72014-04-21 12:52:59 +0800134 return true;
135
136 return false;
Johannes Bergb2e77712007-09-26 15:19:39 +0200137}
138
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200139static int
Johannes Berg1f7bba72014-11-06 22:56:36 +0100140ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
141 struct ieee80211_rx_status *status,
142 struct sk_buff *skb)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200143{
144 int len;
145
146 /* always present fields */
Johannes Berga144f372013-07-03 13:34:02 +0200147 len = sizeof(struct ieee80211_radiotap_header) + 8;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200148
Johannes Berga144f372013-07-03 13:34:02 +0200149 /* allocate extra bitmaps */
Johannes Berga144f372013-07-03 13:34:02 +0200150 if (status->chains)
151 len += 4 * hweight8(status->chains);
Johannes Berg90b9e4462012-11-16 10:09:08 +0100152
153 if (ieee80211_have_rx_timestamp(status)) {
154 len = ALIGN(len, 8);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200155 len += 8;
Johannes Berg90b9e4462012-11-16 10:09:08 +0100156 }
Johannes Berg30686bf2015-06-02 21:39:54 +0200157 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200158 len += 1;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200159
Johannes Berga144f372013-07-03 13:34:02 +0200160 /* antenna field, if we don't have per-chain info */
161 if (!status->chains)
162 len += 1;
163
Johannes Berg90b9e4462012-11-16 10:09:08 +0100164 /* padding for RX_FLAGS if necessary */
165 len = ALIGN(len, 2);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200166
Johannes Berg6d744ba2011-01-27 14:13:17 +0100167 if (status->flag & RX_FLAG_HT) /* HT info */
168 len += 3;
169
Johannes Berg4c298672012-07-05 11:34:31 +0200170 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100171 len = ALIGN(len, 4);
Johannes Berg4c298672012-07-05 11:34:31 +0200172 len += 8;
173 }
174
Johannes Berg51648922012-11-22 23:00:18 +0100175 if (status->flag & RX_FLAG_VHT) {
176 len = ALIGN(len, 2);
177 len += 12;
178 }
179
Johannes Berga144f372013-07-03 13:34:02 +0200180 if (status->chains) {
181 /* antenna and antenna signal fields */
182 len += 2 * hweight8(status->chains);
183 }
184
Johannes Berg1f7bba72014-11-06 22:56:36 +0100185 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
186 struct ieee80211_vendor_radiotap *rtap = (void *)skb->data;
187
188 /* vendor presence bitmap */
189 len += 4;
190 /* alignment for fixed 6-byte vendor data header */
191 len = ALIGN(len, 2);
192 /* vendor data header */
193 len += 6;
194 if (WARN_ON(rtap->align == 0))
195 rtap->align = 1;
196 len = ALIGN(len, rtap->align);
197 len += rtap->len + rtap->pad;
198 }
199
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200200 return len;
201}
202
Johannes Berg00ea6de2012-09-05 15:54:51 +0200203/*
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200204 * ieee80211_add_rx_radiotap_header - add radiotap header
205 *
206 * add a radiotap header containing all the fields which the hardware provided.
207 */
208static void
209ieee80211_add_rx_radiotap_header(struct ieee80211_local *local,
210 struct sk_buff *skb,
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200211 struct ieee80211_rate *rate,
Felix Fietkau973ef212012-04-16 14:56:48 +0200212 int rtap_len, bool has_fcs)
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200213{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200214 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200215 struct ieee80211_radiotap_header *rthdr;
216 unsigned char *pos;
Johannes Berga144f372013-07-03 13:34:02 +0200217 __le32 *it_present;
218 u32 it_present_val;
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100219 u16 rx_flags = 0;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200220 u16 channel_flags = 0;
Johannes Berga144f372013-07-03 13:34:02 +0200221 int mpdulen, chain;
222 unsigned long chains = status->chains;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100223 struct ieee80211_vendor_radiotap rtap = {};
224
225 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
226 rtap = *(struct ieee80211_vendor_radiotap *)skb->data;
227 /* rtap.len and rtap.pad are undone immediately */
228 skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad);
229 }
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800230
231 mpdulen = skb->len;
Johannes Berg30686bf2015-06-02 21:39:54 +0200232 if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)))
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800233 mpdulen += FCS_LEN;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200234
235 rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len);
Johannes Berg1f7bba72014-11-06 22:56:36 +0100236 memset(rthdr, 0, rtap_len - rtap.len - rtap.pad);
Johannes Berga144f372013-07-03 13:34:02 +0200237 it_present = &rthdr->it_present;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200238
239 /* radiotap header, set always present flags */
Emmanuel Grumbach0059b2b2014-02-05 16:36:01 +0200240 rthdr->it_len = cpu_to_le16(rtap_len);
Johannes Berga144f372013-07-03 13:34:02 +0200241 it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) |
242 BIT(IEEE80211_RADIOTAP_CHANNEL) |
243 BIT(IEEE80211_RADIOTAP_RX_FLAGS);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200244
Johannes Berga144f372013-07-03 13:34:02 +0200245 if (!status->chains)
246 it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA);
247
248 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
249 it_present_val |=
250 BIT(IEEE80211_RADIOTAP_EXT) |
251 BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE);
252 put_unaligned_le32(it_present_val, it_present);
253 it_present++;
254 it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) |
255 BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
256 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200257
Johannes Berg1f7bba72014-11-06 22:56:36 +0100258 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
259 it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) |
260 BIT(IEEE80211_RADIOTAP_EXT);
261 put_unaligned_le32(it_present_val, it_present);
262 it_present++;
263 it_present_val = rtap.present;
264 }
265
Johannes Berga144f372013-07-03 13:34:02 +0200266 put_unaligned_le32(it_present_val, it_present);
267
268 pos = (void *)(it_present + 1);
269
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200270 /* the order of the following fields is important */
271
272 /* IEEE80211_RADIOTAP_TSFT */
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800273 if (ieee80211_have_rx_timestamp(status)) {
Johannes Berg90b9e4462012-11-16 10:09:08 +0100274 /* padding */
275 while ((pos - (u8 *)rthdr) & 7)
276 *pos++ = 0;
Thomas Pedersenf4bda332012-11-13 10:46:27 -0800277 put_unaligned_le64(
278 ieee80211_calculate_rx_timestamp(local, status,
279 mpdulen, 0),
280 pos);
Johannes Berg1df332e2012-10-26 00:09:11 +0200281 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200282 pos += 8;
283 }
284
285 /* IEEE80211_RADIOTAP_FLAGS */
Johannes Berg30686bf2015-06-02 21:39:54 +0200286 if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200287 *pos |= IEEE80211_RADIOTAP_F_FCS;
Johannes Bergaae89832009-03-13 12:52:10 +0100288 if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC))
289 *pos |= IEEE80211_RADIOTAP_F_BADFCS;
Bruno Randolfb4f28bb2008-07-30 17:19:55 +0200290 if (status->flag & RX_FLAG_SHORTPRE)
291 *pos |= IEEE80211_RADIOTAP_F_SHORTPRE;
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200292 pos++;
293
294 /* IEEE80211_RADIOTAP_RATE */
Johannes Berg56146182012-11-09 15:07:02 +0100295 if (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200296 /*
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100297 * Without rate information don't add it. If we have,
Mohammed Shafi Shajakhan38f37be2011-02-07 10:10:04 +0530298 * MCS information is a separate field in radiotap,
Johannes Berg73b48092011-04-18 17:05:21 +0200299 * added below. The byte here is needed as padding
300 * for the channel though, so initialise it to 0.
Jouni Malinen0fb8ca42008-12-12 14:38:33 +0200301 */
302 *pos = 0;
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200303 } else {
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200304 int shift = 0;
Jouni Malinenebe6c7b2009-01-10 11:47:33 +0200305 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
Simon Wunderlich2103dec2013-07-08 16:55:53 +0200306 if (status->flag & RX_FLAG_10MHZ)
307 shift = 1;
308 else if (status->flag & RX_FLAG_5MHZ)
309 shift = 2;
310 *pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift));
Jouni Malinen8d6f6582008-12-15 10:37:50 +0200311 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200312 pos++;
313
314 /* IEEE80211_RADIOTAP_CHANNEL */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100315 put_unaligned_le16(status->freq, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200316 pos += 2;
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200317 if (status->flag & RX_FLAG_10MHZ)
318 channel_flags |= IEEE80211_CHAN_HALF;
319 else if (status->flag & RX_FLAG_5MHZ)
320 channel_flags |= IEEE80211_CHAN_QUARTER;
321
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200322 if (status->band == IEEE80211_BAND_5GHZ)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200323 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ;
Johannes Berg56146182012-11-09 15:07:02 +0100324 else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200325 channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100326 else if (rate && rate->flags & IEEE80211_RATE_ERP_G)
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200327 channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100328 else if (rate)
Mathy Vanhoef3a5c5e82015-01-20 15:05:08 +0100329 channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ;
Johannes Bergf8d1ccf2011-11-08 12:28:33 +0100330 else
Simon Wunderlicha5e70692013-07-08 16:55:52 +0200331 channel_flags |= IEEE80211_CHAN_2GHZ;
332 put_unaligned_le16(channel_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200333 pos += 2;
334
335 /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */
Johannes Berg30686bf2015-06-02 21:39:54 +0200336 if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) &&
Felix Fietkaufe8431f2012-03-01 18:00:07 +0100337 !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200338 *pos = status->signal;
339 rthdr->it_present |=
340 cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
341 pos++;
342 }
343
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200344 /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */
345
Johannes Berga144f372013-07-03 13:34:02 +0200346 if (!status->chains) {
347 /* IEEE80211_RADIOTAP_ANTENNA */
348 *pos = status->antenna;
349 pos++;
350 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200351
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200352 /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */
353
354 /* IEEE80211_RADIOTAP_RX_FLAGS */
355 /* ensure 2 byte alignment for the 2 byte field as required */
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100356 if ((pos - (u8 *)rthdr) & 1)
Johannes Berg90b9e4462012-11-16 10:09:08 +0100357 *pos++ = 0;
Johannes Bergaae89832009-03-13 12:52:10 +0100358 if (status->flag & RX_FLAG_FAILED_PLCP_CRC)
Johannes Berg6a86b9c2009-10-28 09:58:52 +0100359 rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP;
360 put_unaligned_le16(rx_flags, pos);
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200361 pos += 2;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100362
363 if (status->flag & RX_FLAG_HT) {
Oleksij Rempel786677d2013-05-24 12:05:45 +0200364 unsigned int stbc;
365
Johannes Berg6d744ba2011-01-27 14:13:17 +0100366 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
Johannes Bergac55d2f2012-05-10 09:09:10 +0200367 *pos++ = local->hw.radiotap_mcs_details;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100368 *pos = 0;
369 if (status->flag & RX_FLAG_SHORT_GI)
370 *pos |= IEEE80211_RADIOTAP_MCS_SGI;
371 if (status->flag & RX_FLAG_40MHZ)
372 *pos |= IEEE80211_RADIOTAP_MCS_BW_40;
Johannes Bergac55d2f2012-05-10 09:09:10 +0200373 if (status->flag & RX_FLAG_HT_GF)
374 *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200375 if (status->flag & RX_FLAG_LDPC)
376 *pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC;
Oleksij Rempel786677d2013-05-24 12:05:45 +0200377 stbc = (status->flag & RX_FLAG_STBC_MASK) >> RX_FLAG_STBC_SHIFT;
378 *pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT;
Johannes Berg6d744ba2011-01-27 14:13:17 +0100379 pos++;
380 *pos++ = status->rate_idx;
381 }
Johannes Berg4c298672012-07-05 11:34:31 +0200382
383 if (status->flag & RX_FLAG_AMPDU_DETAILS) {
384 u16 flags = 0;
385
386 /* ensure 4 byte alignment */
387 while ((pos - (u8 *)rthdr) & 3)
388 pos++;
389 rthdr->it_present |=
390 cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS);
391 put_unaligned_le32(status->ampdu_reference, pos);
392 pos += 4;
Johannes Berg4c298672012-07-05 11:34:31 +0200393 if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN)
394 flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN;
395 if (status->flag & RX_FLAG_AMPDU_IS_LAST)
396 flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST;
397 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR)
398 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR;
399 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
400 flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN;
401 put_unaligned_le16(flags, pos);
402 pos += 2;
403 if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN)
404 *pos++ = status->ampdu_delimiter_crc;
405 else
406 *pos++ = 0;
407 *pos++ = 0;
408 }
Johannes Berg90b9e4462012-11-16 10:09:08 +0100409
Johannes Berg51648922012-11-22 23:00:18 +0100410 if (status->flag & RX_FLAG_VHT) {
411 u16 known = local->hw.radiotap_vht_details;
412
413 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
Johannes Berg51648922012-11-22 23:00:18 +0100414 put_unaligned_le16(known, pos);
415 pos += 2;
416 /* flags */
417 if (status->flag & RX_FLAG_SHORT_GI)
418 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200419 /* in VHT, STBC is binary */
420 if (status->flag & RX_FLAG_STBC_MASK)
421 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC;
Emmanuel Grumbachfb378c22014-03-04 10:35:25 +0200422 if (status->vht_flag & RX_VHT_FLAG_BF)
423 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED;
Johannes Berg51648922012-11-22 23:00:18 +0100424 pos++;
425 /* bandwidth */
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200426 if (status->vht_flag & RX_VHT_FLAG_80MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100427 *pos++ = 4;
Emmanuel Grumbach1b8d2422014-02-05 16:37:11 +0200428 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
Johannes Berg51648922012-11-22 23:00:18 +0100429 *pos++ = 11;
430 else if (status->flag & RX_FLAG_40MHZ)
431 *pos++ = 1;
432 else /* 20 MHz */
433 *pos++ = 0;
434 /* MCS/NSS */
435 *pos = (status->rate_idx << 4) | status->vht_nss;
436 pos += 4;
437 /* coding field */
Emmanuel Grumbach63c361f2014-02-05 12:48:53 +0200438 if (status->flag & RX_FLAG_LDPC)
439 *pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0;
Johannes Berg51648922012-11-22 23:00:18 +0100440 pos++;
441 /* group ID */
442 pos++;
443 /* partial_aid */
444 pos += 2;
445 }
446
Johannes Berga144f372013-07-03 13:34:02 +0200447 for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) {
448 *pos++ = status->chain_signal[chain];
449 *pos++ = chain;
450 }
Johannes Berg1f7bba72014-11-06 22:56:36 +0100451
452 if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) {
453 /* ensure 2 byte alignment for the vendor field as required */
454 if ((pos - (u8 *)rthdr) & 1)
455 *pos++ = 0;
456 *pos++ = rtap.oui[0];
457 *pos++ = rtap.oui[1];
458 *pos++ = rtap.oui[2];
459 *pos++ = rtap.subns;
460 put_unaligned_le16(rtap.len, pos);
461 pos += 2;
462 /* align the actual payload as requested */
463 while ((pos - (u8 *)rthdr) & (rtap.align - 1))
464 *pos++ = 0;
465 /* data (and possible padding) already follows */
466 }
Bruno Randolf601ae7f2008-05-08 19:22:43 +0200467}
468
Johannes Bergb2e77712007-09-26 15:19:39 +0200469/*
470 * This function copies a received frame to all monitor interfaces and
471 * returns a cleaned-up SKB that no longer includes the FCS nor the
472 * radiotap header the driver might have added.
473 */
474static struct sk_buff *
475ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
Johannes Berg8318d782008-01-24 19:38:38 +0100476 struct ieee80211_rate *rate)
Johannes Bergb2e77712007-09-26 15:19:39 +0200477{
Johannes Bergf1d58c22009-06-17 13:13:00 +0200478 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200479 struct ieee80211_sub_if_data *sdata;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100480 int rt_hdrlen, needed_headroom;
Johannes Bergb2e77712007-09-26 15:19:39 +0200481 struct sk_buff *skb, *skb2;
482 struct net_device *prev_dev = NULL;
483 int present_fcs_len = 0;
Johannes Berg1f7bba72014-11-06 22:56:36 +0100484 unsigned int rtap_vendor_space = 0;
485
486 if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) {
487 struct ieee80211_vendor_radiotap *rtap = (void *)origskb->data;
488
489 rtap_vendor_space = sizeof(*rtap) + rtap->len + rtap->pad;
490 }
Johannes Bergb2e77712007-09-26 15:19:39 +0200491
492 /*
493 * First, we may need to make a copy of the skb because
494 * (1) we need to modify it for radiotap (if not present), and
495 * (2) the other RX handlers will modify the skb we got.
496 *
497 * We don't need to, of course, if we aren't going to return
498 * the SKB because it has a bad FCS/PLCP checksum.
499 */
Johannes Berg0869aea2009-10-28 10:03:35 +0100500
Johannes Berg30686bf2015-06-02 21:39:54 +0200501 if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))
Johannes Bergb2e77712007-09-26 15:19:39 +0200502 present_fcs_len = FCS_LEN;
503
Johannes Berg1f7bba72014-11-06 22:56:36 +0100504 /* ensure hdr->frame_control and vendor radiotap data are in skb head */
505 if (!pskb_may_pull(origskb, 2 + rtap_vendor_space)) {
Zhu Yie3cf8b32010-03-29 17:35:07 +0800506 dev_kfree_skb(origskb);
507 return NULL;
508 }
509
Johannes Bergb2e77712007-09-26 15:19:39 +0200510 if (!local->monitors) {
Johannes Berg1f7bba72014-11-06 22:56:36 +0100511 if (should_drop_frame(origskb, present_fcs_len,
512 rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200513 dev_kfree_skb(origskb);
514 return NULL;
515 }
516
Johannes Berg1f7bba72014-11-06 22:56:36 +0100517 return remove_monitor_info(local, origskb, rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200518 }
519
Helmut Schaa751413e2012-12-05 14:36:12 +0100520 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100521 rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
522 needed_headroom = rt_hdrlen - rtap_vendor_space;
Helmut Schaa751413e2012-12-05 14:36:12 +0100523
Johannes Berg1f7bba72014-11-06 22:56:36 +0100524 if (should_drop_frame(origskb, present_fcs_len, rtap_vendor_space)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200525 /* only need to expand headroom if necessary */
526 skb = origskb;
527 origskb = NULL;
528
529 /*
530 * This shouldn't trigger often because most devices have an
531 * RX header they pull before we get here, and that should
532 * be big enough for our radiotap information. We should
533 * probably export the length to drivers so that we can have
534 * them allocate enough headroom to start with.
535 */
536 if (skb_headroom(skb) < needed_headroom &&
Johannes Bergc49e5ea2007-12-11 21:33:42 +0100537 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) {
Johannes Bergb2e77712007-09-26 15:19:39 +0200538 dev_kfree_skb(skb);
539 return NULL;
540 }
541 } else {
542 /*
543 * Need to make a copy and possibly remove radiotap header
544 * and FCS from the original.
545 */
546 skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC);
547
Johannes Berg1f7bba72014-11-06 22:56:36 +0100548 origskb = remove_monitor_info(local, origskb,
549 rtap_vendor_space);
Johannes Bergb2e77712007-09-26 15:19:39 +0200550
551 if (!skb)
552 return origskb;
553 }
554
Johannes Berg0869aea2009-10-28 10:03:35 +0100555 /* prepend radiotap information */
Johannes Berg1f7bba72014-11-06 22:56:36 +0100556 ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true);
Johannes Bergb2e77712007-09-26 15:19:39 +0200557
Johannes Bergce3edf6d02007-12-19 01:31:22 +0100558 skb_reset_mac_header(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200559 skb->ip_summed = CHECKSUM_UNNECESSARY;
560 skb->pkt_type = PACKET_OTHERHOST;
561 skb->protocol = htons(ETH_P_802_2);
562
563 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200564 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Bergb2e77712007-09-26 15:19:39 +0200565 continue;
566
Michael Wu3d30d942008-01-31 19:48:27 +0100567 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)
568 continue;
569
Johannes Berg9607e6b2009-12-23 13:15:31 +0100570 if (!ieee80211_sdata_running(sdata))
Johannes Berg47846c92009-11-25 17:46:19 +0100571 continue;
572
Johannes Bergb2e77712007-09-26 15:19:39 +0200573 if (prev_dev) {
574 skb2 = skb_clone(skb, GFP_ATOMIC);
575 if (skb2) {
576 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400577 netif_receive_skb(skb2);
Johannes Bergb2e77712007-09-26 15:19:39 +0200578 }
579 }
580
581 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +0200582 ieee80211_rx_stats(sdata->dev, skb->len);
Johannes Bergb2e77712007-09-26 15:19:39 +0200583 }
584
585 if (prev_dev) {
586 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -0400587 netif_receive_skb(skb);
Johannes Bergb2e77712007-09-26 15:19:39 +0200588 } else
589 dev_kfree_skb(skb);
590
591 return origskb;
592}
593
Johannes Berg5cf121c2008-02-25 16:27:43 +0100594static void ieee80211_parse_qos(struct ieee80211_rx_data *rx)
Johannes Berg6e0d1142007-07-27 15:43:22 +0200595{
Harvey Harrison238f74a2008-07-02 11:05:34 -0700596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +0200597 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg9e262972011-07-07 18:45:03 +0200598 int tid, seqno_idx, security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200599
600 /* does the frame have a qos control field? */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700601 if (ieee80211_is_data_qos(hdr->frame_control)) {
602 u8 *qc = ieee80211_get_qos_ctl(hdr);
Johannes Berg6e0d1142007-07-27 15:43:22 +0200603 /* frame has qos control */
Harvey Harrison238f74a2008-07-02 11:05:34 -0700604 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
Johannes Berg04b7dcf2011-06-22 10:06:59 +0200605 if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT)
Johannes Berg554891e2010-09-24 12:38:25 +0200606 status->rx_flags |= IEEE80211_RX_AMSDU;
Johannes Berg9e262972011-07-07 18:45:03 +0200607
608 seqno_idx = tid;
609 security_idx = tid;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200610 } else {
Johannes Berg1411f9b2008-07-10 10:11:02 +0200611 /*
612 * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"):
613 *
614 * Sequence numbers for management frames, QoS data
615 * frames with a broadcast/multicast address in the
616 * Address 1 field, and all non-QoS data frames sent
617 * by QoS STAs are assigned using an additional single
618 * modulo-4096 counter, [...]
619 *
620 * We also use that counter for non-QoS STAs.
621 */
Johannes Berg5a306f52012-11-14 23:22:21 +0100622 seqno_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200623 security_idx = 0;
624 if (ieee80211_is_mgmt(hdr->frame_control))
Johannes Berg5a306f52012-11-14 23:22:21 +0100625 security_idx = IEEE80211_NUM_TIDS;
Johannes Berg9e262972011-07-07 18:45:03 +0200626 tid = 0;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200627 }
Johannes Berg52865dfd2007-07-27 15:43:22 +0200628
Johannes Berg9e262972011-07-07 18:45:03 +0200629 rx->seqno_idx = seqno_idx;
630 rx->security_idx = security_idx;
Johannes Berg6e0d1142007-07-27 15:43:22 +0200631 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
632 * For now, set skb->priority to 0 for other cases. */
633 rx->skb->priority = (tid > 7) ? 0 : tid;
Johannes Berg38f37142008-01-29 17:07:43 +0100634}
Johannes Berg6e0d1142007-07-27 15:43:22 +0200635
Johannes Bergd1c3a372009-01-07 00:26:10 +0100636/**
637 * DOC: Packet alignment
638 *
639 * Drivers always need to pass packets that are aligned to two-byte boundaries
640 * to the stack.
641 *
642 * Additionally, should, if possible, align the payload data in a way that
643 * guarantees that the contained IP header is aligned to a four-byte
644 * boundary. In the case of regular frames, this simply means aligning the
645 * payload to a four-byte boundary (because either the IP header is directly
646 * contained, or IV/RFC1042 headers that have a length divisible by four are
Kalle Valo59d9cb02009-12-17 13:54:57 +0100647 * in front of it). If the payload data is not properly aligned and the
648 * architecture doesn't support efficient unaligned operations, mac80211
649 * will align the data.
Johannes Bergd1c3a372009-01-07 00:26:10 +0100650 *
651 * With A-MSDU frames, however, the payload data address must yield two modulo
652 * four because there are 14-byte 802.3 headers within the A-MSDU frames that
653 * push the IP header further back to a multiple of four again. Thankfully, the
654 * specs were sane enough this time around to require padding each A-MSDU
655 * subframe to a length that is a multiple of four.
656 *
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300657 * Padding like Atheros hardware adds which is between the 802.11 header and
Johannes Bergd1c3a372009-01-07 00:26:10 +0100658 * the payload is not supported, the driver is required to move the 802.11
659 * header to be directly in front of the payload in that case.
660 */
661static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx)
Johannes Berg38f37142008-01-29 17:07:43 +0100662{
Kalle Valo59d9cb02009-12-17 13:54:57 +0100663#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg441275e2015-11-06 12:34:24 +0100664 WARN_ON_ONCE((unsigned long)rx->skb->data & 1);
Johannes Bergd1c3a372009-01-07 00:26:10 +0100665#endif
Johannes Berg6e0d1142007-07-27 15:43:22 +0200666}
667
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +0200668
Johannes Berg571ecf62007-07-27 15:43:22 +0200669/* rx handlers */
670
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200671static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb)
672{
673 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
674
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100675 if (is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200676 return 0;
677
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100678 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200679}
680
681
682static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb)
683{
684 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
685
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100686 if (!is_multicast_ether_addr(hdr->addr1))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200687 return 0;
688
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100689 return ieee80211_is_robust_mgmt_frame(skb);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200690}
691
692
693/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */
694static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
695{
696 struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
697 struct ieee80211_mmie *mmie;
Jouni Malinen56c52da2015-01-24 19:52:08 +0200698 struct ieee80211_mmie_16 *mmie16;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200699
Johannes Berg1df332e2012-10-26 00:09:11 +0200700 if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200701 return -1;
702
Johannes Bergd8ca16d2014-01-23 16:20:29 +0100703 if (!ieee80211_is_robust_mgmt_frame(skb))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200704 return -1; /* not a robust management frame */
705
706 mmie = (struct ieee80211_mmie *)
707 (skb->data + skb->len - sizeof(*mmie));
Jouni Malinen56c52da2015-01-24 19:52:08 +0200708 if (mmie->element_id == WLAN_EID_MMIE &&
709 mmie->length == sizeof(*mmie) - 2)
710 return le16_to_cpu(mmie->key_id);
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200711
Jouni Malinen56c52da2015-01-24 19:52:08 +0200712 mmie16 = (struct ieee80211_mmie_16 *)
713 (skb->data + skb->len - sizeof(*mmie16));
714 if (skb->len >= 24 + sizeof(*mmie16) &&
715 mmie16->element_id == WLAN_EID_MMIE &&
716 mmie16->length == sizeof(*mmie16) - 2)
717 return le16_to_cpu(mmie16->key_id);
718
719 return -1;
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +0200720}
721
Max Stepanov2475b1cc2013-03-24 14:23:27 +0200722static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
723 struct sk_buff *skb)
724{
725 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
726 __le16 fc;
727 int hdrlen;
728 u8 keyid;
729
730 fc = hdr->frame_control;
731 hdrlen = ieee80211_hdrlen(fc);
732
733 if (skb->len < hdrlen + cs->hdr_len)
734 return -EINVAL;
735
736 skb_copy_bits(skb, hdrlen + cs->key_idx_off, &keyid, 1);
737 keyid &= cs->key_idx_mask;
738 keyid >>= cs->key_idx_shift;
739
740 return keyid;
741}
742
Johannes Berg1df332e2012-10-26 00:09:11 +0200743static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100744{
Harvey Harrisona7767f92008-07-02 16:30:51 -0700745 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg47846c92009-11-25 17:46:19 +0100746 char *dev_addr = rx->sdata->vif.addr;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100747
Harvey Harrisona7767f92008-07-02 16:30:51 -0700748 if (ieee80211_is_data(hdr->frame_control)) {
Javier Cardona3c5772a2009-08-10 12:15:48 -0700749 if (is_multicast_ether_addr(hdr->addr1)) {
750 if (ieee80211_has_tods(hdr->frame_control) ||
Johannes Berg1df332e2012-10-26 00:09:11 +0200751 !ieee80211_has_fromds(hdr->frame_control))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700752 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000753 if (ether_addr_equal(hdr->addr3, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700754 return RX_DROP_MONITOR;
755 } else {
756 if (!ieee80211_has_a4(hdr->frame_control))
757 return RX_DROP_MONITOR;
Joe Perchesb203ca32012-05-08 18:56:52 +0000758 if (ether_addr_equal(hdr->addr4, dev_addr))
Javier Cardona3c5772a2009-08-10 12:15:48 -0700759 return RX_DROP_MONITOR;
760 }
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100761 }
762
763 /* If there is not an established peer link and this is not a peer link
764 * establisment frame, beacon or probe, drop the frame.
765 */
766
Javier Cardona57cf8042011-05-13 10:45:43 -0700767 if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) {
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100768 struct ieee80211_mgmt *mgmt;
Johannes Bergd6d1a5a2008-02-25 16:24:38 +0100769
Harvey Harrisona7767f92008-07-02 16:30:51 -0700770 if (!ieee80211_is_mgmt(hdr->frame_control))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100771 return RX_DROP_MONITOR;
772
Harvey Harrisona7767f92008-07-02 16:30:51 -0700773 if (ieee80211_is_action(hdr->frame_control)) {
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700774 u8 category;
Johannes Berg9b395bc2012-10-26 00:36:40 +0200775
776 /* make sure category field is present */
777 if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
778 return RX_DROP_MONITOR;
779
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100780 mgmt = (struct ieee80211_mgmt *)hdr;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -0700781 category = mgmt->u.action.category;
782 if (category != WLAN_CATEGORY_MESH_ACTION &&
Johannes Berg1df332e2012-10-26 00:09:11 +0200783 category != WLAN_CATEGORY_SELF_PROTECTED)
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100784 return RX_DROP_MONITOR;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100785 return RX_CONTINUE;
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100786 }
787
Harvey Harrisona7767f92008-07-02 16:30:51 -0700788 if (ieee80211_is_probe_req(hdr->frame_control) ||
789 ieee80211_is_probe_resp(hdr->frame_control) ||
Javier Cardona71839122011-04-07 15:08:31 -0700790 ieee80211_is_beacon(hdr->frame_control) ||
791 ieee80211_is_auth(hdr->frame_control))
Harvey Harrisona7767f92008-07-02 16:30:51 -0700792 return RX_CONTINUE;
793
794 return RX_DROP_MONITOR;
Harvey Harrisona7767f92008-07-02 16:30:51 -0700795 }
796
Johannes Berg902acc72008-02-23 15:17:19 +0100797 return RX_CONTINUE;
798}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +0100799
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200800static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100801 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000802 int index,
803 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100804{
Michal Kazior83eb9352014-07-16 12:09:31 +0200805 struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index];
806 struct sk_buff *skb;
Christian Lamparter4cfda472010-12-27 23:21:26 +0100807 struct ieee80211_rx_status *status;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100808
Johannes Bergdd318572010-11-29 11:09:16 +0100809 lockdep_assert_held(&tid_agg_rx->reorder_lock);
810
Michal Kazior83eb9352014-07-16 12:09:31 +0200811 if (skb_queue_empty(skb_list))
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100812 goto no_frame;
813
Michal Kazior83eb9352014-07-16 12:09:31 +0200814 if (!ieee80211_rx_reorder_ready(skb_list)) {
815 __skb_queue_purge(skb_list);
816 goto no_frame;
817 }
818
819 /* release frames from the reorder ring buffer */
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100820 tid_agg_rx->stored_mpdu_num--;
Michal Kazior83eb9352014-07-16 12:09:31 +0200821 while ((skb = __skb_dequeue(skb_list))) {
822 status = IEEE80211_SKB_RXCB(skb);
823 status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE;
824 __skb_queue_tail(frames, skb);
825 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100826
827no_frame:
Johannes Berg9a886582013-02-15 19:25:00 +0100828 tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100829}
830
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200831static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100832 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000833 u16 head_seq_num,
834 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100835{
836 int index;
837
Johannes Bergdd318572010-11-29 11:09:16 +0100838 lockdep_assert_held(&tid_agg_rx->reorder_lock);
839
Johannes Berg9a886582013-02-15 19:25:00 +0100840 while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200841 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000842 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
843 frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100844 }
845}
846
847/*
848 * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If
849 * the skb was added to the buffer longer than this time ago, the earlier
850 * frames that have not yet been received are assumed to be lost and the skb
851 * can be released for processing. This may also release other skb's from the
852 * reorder buffer if there are no additional gaps between the frames.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200853 *
854 * Callers must hold tid_agg_rx->reorder_lock.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100855 */
856#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10)
857
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200858static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000859 struct tid_ampdu_rx *tid_agg_rx,
860 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200861{
Michal Kazior83eb9352014-07-16 12:09:31 +0200862 int index, i, j;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200863
Johannes Bergdd318572010-11-29 11:09:16 +0100864 lockdep_assert_held(&tid_agg_rx->reorder_lock);
865
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200866 /* release the buffer until next missing frame */
Karl Beldan2e3049b2013-10-24 15:53:32 +0200867 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Michal Kazior83eb9352014-07-16 12:09:31 +0200868 if (!ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index]) &&
Eliad Peller07ae2df2012-02-01 18:48:09 +0200869 tid_agg_rx->stored_mpdu_num) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200870 /*
871 * No buffers ready to be released, but check whether any
872 * frames in the reorder buffer have timed out.
873 */
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200874 int skipped = 1;
875 for (j = (index + 1) % tid_agg_rx->buf_size; j != index;
876 j = (j + 1) % tid_agg_rx->buf_size) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200877 if (!ieee80211_rx_reorder_ready(
878 &tid_agg_rx->reorder_buf[j])) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200879 skipped++;
880 continue;
881 }
Daniel Halperin499fe9a2011-03-24 16:01:48 -0700882 if (skipped &&
883 !time_after(jiffies, tid_agg_rx->reorder_time[j] +
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200884 HT_RX_REORDER_BUF_TIMEOUT))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200885 goto set_release_timer;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200886
Michal Kazior83eb9352014-07-16 12:09:31 +0200887 /* don't leave incomplete A-MSDUs around */
888 for (i = (index + 1) % tid_agg_rx->buf_size; i != j;
889 i = (i + 1) % tid_agg_rx->buf_size)
890 __skb_queue_purge(&tid_agg_rx->reorder_buf[i]);
891
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200892 ht_dbg_ratelimited(sdata,
893 "release an RX reorder frame due to timeout on earlier frames\n");
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000894 ieee80211_release_reorder_frame(sdata, tid_agg_rx, j,
895 frames);
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200896
897 /*
898 * Increment the head seq# also for the skipped slots.
899 */
900 tid_agg_rx->head_seq_num =
Johannes Berg9a886582013-02-15 19:25:00 +0100901 (tid_agg_rx->head_seq_num +
902 skipped) & IEEE80211_SN_MASK;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200903 skipped = 0;
904 }
Michal Kazior83eb9352014-07-16 12:09:31 +0200905 } else while (ieee80211_rx_reorder_ready(
906 &tid_agg_rx->reorder_buf[index])) {
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000907 ieee80211_release_reorder_frame(sdata, tid_agg_rx, index,
908 frames);
Karl Beldan2e3049b2013-10-24 15:53:32 +0200909 index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200910 }
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200911
912 if (tid_agg_rx->stored_mpdu_num) {
Karl Beldan2e3049b2013-10-24 15:53:32 +0200913 j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200914
915 for (; j != (index - 1) % tid_agg_rx->buf_size;
916 j = (j + 1) % tid_agg_rx->buf_size) {
Michal Kazior83eb9352014-07-16 12:09:31 +0200917 if (ieee80211_rx_reorder_ready(
918 &tid_agg_rx->reorder_buf[j]))
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200919 break;
920 }
921
922 set_release_timer:
923
Johannes Berg788211d2015-04-01 14:20:42 +0200924 if (!tid_agg_rx->removed)
925 mod_timer(&tid_agg_rx->reorder_timer,
926 tid_agg_rx->reorder_time[j] + 1 +
927 HT_RX_REORDER_BUF_TIMEOUT);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200928 } else {
929 del_timer(&tid_agg_rx->reorder_timer);
930 }
Christian Lamparteraa0c8632010-08-05 01:36:04 +0200931}
932
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100933/*
934 * As this function belongs to the RX path it must be under
935 * rcu_read_lock protection. It returns false if the frame
936 * can be processed immediately, true if it was consumed.
937 */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200938static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata,
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100939 struct tid_ampdu_rx *tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000940 struct sk_buff *skb,
941 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100942{
943 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Michal Kazior83eb9352014-07-16 12:09:31 +0200944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100945 u16 sc = le16_to_cpu(hdr->seq_ctrl);
946 u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4;
947 u16 head_seq_num, buf_size;
948 int index;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200949 bool ret = true;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100950
Johannes Bergdd318572010-11-29 11:09:16 +0100951 spin_lock(&tid_agg_rx->reorder_lock);
952
Michal Kazior4549cf22014-09-02 14:05:10 +0200953 /*
954 * Offloaded BA sessions have no known starting sequence number so pick
955 * one from first Rxed frame for this tid after BA was started.
956 */
957 if (unlikely(tid_agg_rx->auto_seq)) {
958 tid_agg_rx->auto_seq = false;
959 tid_agg_rx->ssn = mpdu_seq_num;
960 tid_agg_rx->head_seq_num = mpdu_seq_num;
961 }
962
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100963 buf_size = tid_agg_rx->buf_size;
964 head_seq_num = tid_agg_rx->head_seq_num;
965
966 /* frame with out of date sequence number */
Johannes Berg9a886582013-02-15 19:25:00 +0100967 if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100968 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200969 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100970 }
971
972 /*
973 * If frame the sequence number exceeds our buffering window
974 * size release some previous frames to make room for this one.
975 */
Johannes Berg9a886582013-02-15 19:25:00 +0100976 if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) {
977 head_seq_num = ieee80211_sn_inc(
978 ieee80211_sn_sub(mpdu_seq_num, buf_size));
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100979 /* release stored frames up to new head to stack */
Johannes Bergd3b2fb52012-06-22 12:48:38 +0200980 ieee80211_release_reorder_frames(sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +0000981 head_seq_num, frames);
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100982 }
983
984 /* Now the new frame is always in the range of the reordering buffer */
985
Karl Beldan2e3049b2013-10-24 15:53:32 +0200986 index = mpdu_seq_num % tid_agg_rx->buf_size;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100987
988 /* check if we already stored this frame */
Michal Kazior83eb9352014-07-16 12:09:31 +0200989 if (ieee80211_rx_reorder_ready(&tid_agg_rx->reorder_buf[index])) {
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100990 dev_kfree_skb(skb);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200991 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100992 }
993
994 /*
995 * If the current MPDU is in the right order and nothing else
996 * is stored we can process it directly, no need to buffer it.
Johannes Bergc835b212011-03-15 23:17:01 +0100997 * If it is first but there's something stored, we may be able
998 * to release frames after this one.
Johannes Berg1edfb1a2009-11-25 17:46:16 +0100999 */
1000 if (mpdu_seq_num == tid_agg_rx->head_seq_num &&
1001 tid_agg_rx->stored_mpdu_num == 0) {
Michal Kazior83eb9352014-07-16 12:09:31 +02001002 if (!(status->flag & RX_FLAG_AMSDU_MORE))
1003 tid_agg_rx->head_seq_num =
1004 ieee80211_sn_inc(tid_agg_rx->head_seq_num);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001005 ret = false;
1006 goto out;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001007 }
1008
1009 /* put the frame in the reordering buffer */
Michal Kazior83eb9352014-07-16 12:09:31 +02001010 __skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb);
1011 if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1012 tid_agg_rx->reorder_time[index] = jiffies;
1013 tid_agg_rx->stored_mpdu_num++;
1014 ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames);
1015 }
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001016
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02001017 out:
1018 spin_unlock(&tid_agg_rx->reorder_lock);
1019 return ret;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001020}
1021
1022/*
1023 * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns
1024 * true if the MPDU was buffered, false if it should be processed.
1025 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001026static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
1027 struct sk_buff_head *frames)
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001028{
Johannes Berg2569a822009-11-25 17:46:17 +01001029 struct sk_buff *skb = rx->skb;
1030 struct ieee80211_local *local = rx->local;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001031 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Johannes Berg2569a822009-11-25 17:46:17 +01001032 struct sta_info *sta = rx->sta;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001033 struct tid_ampdu_rx *tid_agg_rx;
1034 u16 sc;
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001035 u8 tid, ack_policy;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001036
Johannes Berg051a41f2013-11-20 11:28:27 +01001037 if (!ieee80211_is_data_qos(hdr->frame_control) ||
1038 is_multicast_ether_addr(hdr->addr1))
Johannes Berg2569a822009-11-25 17:46:17 +01001039 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001040
1041 /*
1042 * filter the QoS data rx stream according to
1043 * STA/TID and check if this STA/TID is on aggregation
1044 */
1045
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001046 if (!sta)
Johannes Berg2569a822009-11-25 17:46:17 +01001047 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001048
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001049 ack_policy = *ieee80211_get_qos_ctl(hdr) &
1050 IEEE80211_QOS_CTL_ACK_POLICY_MASK;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001051 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1052
Johannes Berga87f7362010-06-10 10:21:38 +02001053 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
1054 if (!tid_agg_rx)
1055 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001056
1057 /* qos null data frames are excluded */
1058 if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
Johannes Berga87f7362010-06-10 10:21:38 +02001059 goto dont_reorder;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001060
Thomas Pedersen6cc00d52011-11-03 21:11:11 -07001061 /* not part of a BA session */
1062 if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
1063 ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL)
1064 goto dont_reorder;
1065
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001066 /* new, potentially un-ordered, ampdu frame - process it */
1067
1068 /* reset session timer */
1069 if (tid_agg_rx->timeout)
Felix Fietkau12d3952f2012-03-18 22:58:06 +01001070 tid_agg_rx->last_rx = jiffies;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001071
1072 /* if this mpdu is fragmented - terminate rx aggregation session */
1073 sc = le16_to_cpu(hdr->seq_ctrl);
1074 if (sc & IEEE80211_SCTL_FRAG) {
Johannes Bergc1475ca2010-06-10 10:21:37 +02001075 skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg344eec62010-06-10 10:21:36 +02001076 skb_queue_tail(&rx->sdata->skb_queue, skb);
1077 ieee80211_queue_work(&local->hw, &rx->sdata->work);
Johannes Berg2569a822009-11-25 17:46:17 +01001078 return;
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001079 }
1080
Johannes Berga87f7362010-06-10 10:21:38 +02001081 /*
1082 * No locking needed -- we will only ever process one
1083 * RX packet at a time, and thus own tid_agg_rx. All
1084 * other code manipulating it needs to (and does) make
1085 * sure that we cannot get to it any more before doing
1086 * anything with it.
1087 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001088 if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb,
1089 frames))
Johannes Berg2569a822009-11-25 17:46:17 +01001090 return;
1091
1092 dont_reorder:
Christian Lamparterf9e124f2013-02-04 17:44:44 +00001093 __skb_queue_tail(frames, skb);
Johannes Berg1edfb1a2009-11-25 17:46:16 +01001094}
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001095
Johannes Berg49461622008-06-30 15:10:45 +02001096static ieee80211_rx_result debug_noinline
Johannes Berg03954422014-11-11 16:49:25 +01001097ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001098{
Harvey Harrisona7767f92008-07-02 16:30:51 -07001099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02001100 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001101
Johannes Berg6b0f3272013-07-11 22:33:26 +02001102 /*
1103 * Drop duplicate 802.11 retransmissions
1104 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
1105 */
Johannes Berg03954422014-11-11 16:49:25 +01001106
1107 if (rx->skb->len < 24)
1108 return RX_CONTINUE;
1109
1110 if (ieee80211_is_ctl(hdr->frame_control) ||
1111 ieee80211_is_qos_nullfunc(hdr->frame_control) ||
1112 is_multicast_ether_addr(hdr->addr1))
1113 return RX_CONTINUE;
1114
Johannes Berga732fa72015-10-14 18:27:07 +02001115 if (!rx->sta)
1116 return RX_CONTINUE;
1117
1118 if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
1119 rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) {
1120 I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount);
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001121 rx->sta->rx_stats.num_duplicates++;
Johannes Berga732fa72015-10-14 18:27:07 +02001122 return RX_DROP_UNUSABLE;
1123 } else if (!(status->flag & RX_FLAG_AMSDU_MORE)) {
1124 rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl;
Johannes Berg571ecf62007-07-27 15:43:22 +02001125 }
1126
Johannes Berg03954422014-11-11 16:49:25 +01001127 return RX_CONTINUE;
1128}
1129
1130static ieee80211_rx_result debug_noinline
1131ieee80211_rx_h_check(struct ieee80211_rx_data *rx)
1132{
1133 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
1134
Johannes Berg571ecf62007-07-27 15:43:22 +02001135 /* Drop disallowed frame classes based on STA auth/assoc state;
1136 * IEEE 802.11, Chap 5.5.
1137 *
Johannes Bergccd7b362008-09-11 00:01:56 +02001138 * mac80211 filters only based on association state, i.e. it drops
1139 * Class 3 frames from not associated stations. hostapd sends
Johannes Berg571ecf62007-07-27 15:43:22 +02001140 * deauth/disassoc frames when needed. In addition, hostapd is
1141 * responsible for filtering on both auth and assoc states.
1142 */
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001143
Johannes Berg902acc72008-02-23 15:17:19 +01001144 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001145 return ieee80211_rx_mesh_check(rx);
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001146
Harvey Harrisona7767f92008-07-02 16:30:51 -07001147 if (unlikely((ieee80211_is_data(hdr->frame_control) ||
1148 ieee80211_is_pspoll(hdr->frame_control)) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001149 rx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Bill Jordan1be7fe82010-10-01 11:20:41 -04001150 rx->sdata->vif.type != NL80211_IFTYPE_WDS &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001151 rx->sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001152 (!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) {
Johannes Berg7852e362012-01-20 13:55:24 +01001153 /*
1154 * accept port control frames from the AP even when it's not
1155 * yet marked ASSOC to prevent a race where we don't set the
1156 * assoc bit quickly enough before it sends the first frame
1157 */
1158 if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
Guy Eilam2a33bee2011-08-17 15:18:15 +03001159 ieee80211_is_data_present(hdr->frame_control)) {
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001160 unsigned int hdrlen;
1161 __be16 ethertype;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001162
Johannes Berg6dbda2d2012-10-26 00:41:23 +02001163 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1164
1165 if (rx->skb->len < hdrlen + 8)
1166 return RX_DROP_MONITOR;
1167
1168 skb_copy_bits(rx->skb, hdrlen + 6, &ethertype, 2);
1169 if (ethertype == rx->sdata->control_port_protocol)
Guy Eilam2a33bee2011-08-17 15:18:15 +03001170 return RX_CONTINUE;
1171 }
Johannes Berg21fc7562011-11-04 11:18:13 +01001172
1173 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
1174 cfg80211_rx_spurious_frame(rx->sdata->dev,
1175 hdr->addr2,
1176 GFP_ATOMIC))
1177 return RX_DROP_UNUSABLE;
1178
Johannes Berge4c26ad2008-01-31 19:48:21 +01001179 return RX_DROP_MONITOR;
Guy Eilam2a33bee2011-08-17 15:18:15 +03001180 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001181
Johannes Berg9ae54c82008-01-31 19:48:20 +01001182 return RX_CONTINUE;
Johannes Berg570bd532007-07-27 15:43:22 +02001183}
1184
1185
Johannes Berg49461622008-06-30 15:10:45 +02001186static ieee80211_rx_result debug_noinline
Kalle Valo572e0012009-02-10 17:09:31 +02001187ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
1188{
1189 struct ieee80211_local *local;
1190 struct ieee80211_hdr *hdr;
1191 struct sk_buff *skb;
1192
1193 local = rx->local;
1194 skb = rx->skb;
1195 hdr = (struct ieee80211_hdr *) skb->data;
1196
1197 if (!local->pspolling)
1198 return RX_CONTINUE;
1199
1200 if (!ieee80211_has_fromds(hdr->frame_control))
1201 /* this is not from AP */
1202 return RX_CONTINUE;
1203
1204 if (!ieee80211_is_data(hdr->frame_control))
1205 return RX_CONTINUE;
1206
1207 if (!ieee80211_has_moredata(hdr->frame_control)) {
1208 /* AP has no more frames buffered for us */
1209 local->pspolling = false;
1210 return RX_CONTINUE;
1211 }
1212
1213 /* more data bit is set, let's request a new frame from the AP */
1214 ieee80211_send_pspoll(local, rx->sdata);
1215
1216 return RX_CONTINUE;
1217}
1218
Marco Porschd012a602012-10-10 12:39:50 -07001219static void sta_ps_start(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001220{
Johannes Berg133b8222008-09-16 14:18:59 +02001221 struct ieee80211_sub_if_data *sdata = sta->sdata;
Christian Lamparter4571d3b2008-11-30 00:48:41 +01001222 struct ieee80211_local *local = sdata->local;
Marco Porschd012a602012-10-10 12:39:50 -07001223 struct ps_data *ps;
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001224 int tid;
Joe Perches0795af52007-10-03 17:59:30 -07001225
Marco Porschd012a602012-10-10 12:39:50 -07001226 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1227 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1228 ps = &sdata->bss->ps;
1229 else
1230 return;
1231
1232 atomic_inc(&ps->num_sta_ps);
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001233 set_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Berg30686bf2015-06-02 21:39:54 +02001234 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001235 drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001236 ps_dbg(sdata, "STA %pM aid %d enters power save mode\n",
1237 sta->sta.addr, sta->sta.aid);
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001238
Johannes Berg17c18bf2015-03-21 15:25:43 +01001239 ieee80211_clear_fast_xmit(sta);
1240
Felix Fietkauba8c3d62015-03-27 21:30:37 +01001241 if (!sta->sta.txq[0])
1242 return;
1243
1244 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1245 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1246
1247 if (!skb_queue_len(&txqi->queue))
1248 set_bit(tid, &sta->txq_buffered_tids);
1249 else
1250 clear_bit(tid, &sta->txq_buffered_tids);
1251 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001252}
1253
Marco Porschd012a602012-10-10 12:39:50 -07001254static void sta_ps_end(struct sta_info *sta)
Johannes Berg571ecf62007-07-27 15:43:22 +02001255{
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001256 ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n",
1257 sta->sta.addr, sta->sta.aid);
Johannes Berg004c8722008-02-20 11:21:35 +01001258
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001259 if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
Johannes Berge3685e02014-02-20 11:19:58 +01001260 /*
1261 * Clear the flag only if the other one is still set
1262 * so that the TX path won't start TX'ing new frames
1263 * directly ... In the case that the driver flag isn't
1264 * set ieee80211_sta_ps_deliver_wakeup() will clear it.
1265 */
1266 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001267 ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n",
1268 sta->sta.addr, sta->sta.aid);
Johannes Bergaf818582009-11-06 11:35:50 +01001269 return;
1270 }
1271
Johannes Berg5ac2e352014-05-27 16:32:27 +02001272 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1273 clear_sta_flag(sta, WLAN_STA_PS_STA);
Johannes Bergaf818582009-11-06 11:35:50 +01001274 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg571ecf62007-07-27 15:43:22 +02001275}
1276
Johannes Bergcf471612015-06-16 16:16:38 +02001277int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start)
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001278{
Johannes Bergcf471612015-06-16 16:16:38 +02001279 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001280 bool in_ps;
1281
Johannes Bergcf471612015-06-16 16:16:38 +02001282 WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS));
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001283
1284 /* Don't let the same PS state be set twice */
Johannes Bergcf471612015-06-16 16:16:38 +02001285 in_ps = test_sta_flag(sta, WLAN_STA_PS_STA);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001286 if ((start && in_ps) || (!start && !in_ps))
1287 return -EINVAL;
1288
1289 if (start)
Johannes Bergcf471612015-06-16 16:16:38 +02001290 sta_ps_start(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001291 else
Johannes Bergcf471612015-06-16 16:16:38 +02001292 sta_ps_end(sta);
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001293
1294 return 0;
1295}
1296EXPORT_SYMBOL(ieee80211_sta_ps_transition);
1297
Johannes Berg49461622008-06-30 15:10:45 +02001298static ieee80211_rx_result debug_noinline
Johannes Berg47086fc2011-09-29 16:04:33 +02001299ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx)
1300{
1301 struct ieee80211_sub_if_data *sdata = rx->sdata;
1302 struct ieee80211_hdr *hdr = (void *)rx->skb->data;
1303 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
1304 int tid, ac;
1305
Johannes Berg5c900672015-04-22 14:48:34 +02001306 if (!rx->sta)
Johannes Berg47086fc2011-09-29 16:04:33 +02001307 return RX_CONTINUE;
1308
1309 if (sdata->vif.type != NL80211_IFTYPE_AP &&
1310 sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
1311 return RX_CONTINUE;
1312
1313 /*
1314 * The device handles station powersave, so don't do anything about
1315 * uAPSD and PS-Poll frames (the latter shouldn't even come up from
1316 * it to mac80211 since they're handled.)
1317 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001318 if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS))
Johannes Berg47086fc2011-09-29 16:04:33 +02001319 return RX_CONTINUE;
1320
1321 /*
1322 * Don't do anything if the station isn't already asleep. In
1323 * the uAPSD case, the station will probably be marked asleep,
1324 * in the PS-Poll case the station must be confused ...
1325 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001326 if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA))
Johannes Berg47086fc2011-09-29 16:04:33 +02001327 return RX_CONTINUE;
1328
1329 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001330 if (!test_sta_flag(rx->sta, WLAN_STA_SP)) {
1331 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Bergdeeaee12011-09-29 16:04:35 +02001332 ieee80211_sta_ps_deliver_poll_response(rx->sta);
1333 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001334 set_sta_flag(rx->sta, WLAN_STA_PSPOLL);
Johannes Bergdeeaee12011-09-29 16:04:35 +02001335 }
Johannes Berg47086fc2011-09-29 16:04:33 +02001336
1337 /* Free PS Poll skb here instead of returning RX_DROP that would
1338 * count as an dropped frame. */
1339 dev_kfree_skb(rx->skb);
1340
1341 return RX_QUEUED;
1342 } else if (!ieee80211_has_morefrags(hdr->frame_control) &&
1343 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
1344 ieee80211_has_pm(hdr->frame_control) &&
1345 (ieee80211_is_data_qos(hdr->frame_control) ||
1346 ieee80211_is_qos_nullfunc(hdr->frame_control))) {
1347 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
1348 ac = ieee802_1d_to_ac[tid & 7];
1349
1350 /*
1351 * If this AC is not trigger-enabled do nothing.
1352 *
1353 * NB: This could/should check a separate bitmap of trigger-
1354 * enabled queues, but for now we only implement uAPSD w/o
1355 * TSPEC changes to the ACs, so they're always the same.
1356 */
1357 if (!(rx->sta->sta.uapsd_queues & BIT(ac)))
1358 return RX_CONTINUE;
1359
1360 /* if we are in a service period, do nothing */
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001361 if (test_sta_flag(rx->sta, WLAN_STA_SP))
Johannes Berg47086fc2011-09-29 16:04:33 +02001362 return RX_CONTINUE;
1363
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001364 if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER))
Johannes Berg47086fc2011-09-29 16:04:33 +02001365 ieee80211_sta_ps_deliver_uapsd(rx->sta);
1366 else
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001367 set_sta_flag(rx->sta, WLAN_STA_UAPSD);
Johannes Berg47086fc2011-09-29 16:04:33 +02001368 }
1369
1370 return RX_CONTINUE;
1371}
1372
1373static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001374ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001375{
1376 struct sta_info *sta = rx->sta;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001377 struct sk_buff *skb = rx->skb;
1378 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001380 int i;
Johannes Berg571ecf62007-07-27 15:43:22 +02001381
1382 if (!sta)
Johannes Berg9ae54c82008-01-31 19:48:20 +01001383 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001384
Johannes Bergb291ba12009-07-10 15:29:03 +02001385 /*
1386 * Update last_rx only for IBSS packets which are for the current
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001387 * BSSID and for station already AUTHORIZED to avoid keeping the
1388 * current IBSS network alive in cases where other STAs start
1389 * using different BSSID. This will also give the station another
1390 * chance to restart the authentication/authorization in case
1391 * something went wrong the first time.
Johannes Bergb291ba12009-07-10 15:29:03 +02001392 */
Johannes Berg05c914f2008-09-11 00:01:58 +02001393 if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) {
Ron Rindjunsky71364712007-12-25 17:00:36 +02001394 u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len,
Johannes Berg05c914f2008-09-11 00:01:58 +02001395 NL80211_IFTYPE_ADHOC);
Antonio Quartullie584da5e2012-11-25 23:13:42 +01001396 if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) &&
1397 test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001398 sta->rx_stats.last_rx = jiffies;
Henning Roggef4ebddf2014-05-01 10:03:46 +02001399 if (ieee80211_is_data(hdr->frame_control) &&
1400 !is_multicast_ether_addr(hdr->addr1)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001401 sta->rx_stats.last_rate_idx =
1402 status->rate_idx;
1403 sta->rx_stats.last_rate_flag =
1404 status->flag;
1405 sta->rx_stats.last_rate_vht_flag =
1406 status->vht_flag;
1407 sta->rx_stats.last_rate_vht_nss =
1408 status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001409 }
1410 }
Rostislav Lisovy239281f2014-11-03 10:33:19 +01001411 } else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001412 sta->rx_stats.last_rx = jiffies;
Johannes Bergb291ba12009-07-10 15:29:03 +02001413 } else if (!is_multicast_ether_addr(hdr->addr1)) {
1414 /*
Luis Carlos Cobo33b64eb2008-02-23 15:17:10 +01001415 * Mesh beacons will update last_rx when if they are found to
1416 * match the current local configuration when processed.
Johannes Berg571ecf62007-07-27 15:43:22 +02001417 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001418 sta->rx_stats.last_rx = jiffies;
Felix Fietkau3af63342011-02-27 22:08:01 +01001419 if (ieee80211_is_data(hdr->frame_control)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001420 sta->rx_stats.last_rate_idx = status->rate_idx;
1421 sta->rx_stats.last_rate_flag = status->flag;
1422 sta->rx_stats.last_rate_vht_flag = status->vht_flag;
1423 sta->rx_stats.last_rate_vht_nss = status->vht_nss;
Felix Fietkau3af63342011-02-27 22:08:01 +01001424 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001425 }
1426
Kalle Valo3cf335d2009-03-22 21:57:06 +02001427 if (rx->sdata->vif.type == NL80211_IFTYPE_STATION)
1428 ieee80211_sta_rx_notify(rx->sdata, hdr);
1429
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001430 sta->rx_stats.fragments++;
1431 sta->rx_stats.bytes += rx->skb->len;
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001432 if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001433 sta->rx_stats.last_signal = status->signal;
1434 ewma_signal_add(&sta->rx_stats.avg_signal, -status->signal);
Felix Fietkaufe8431f2012-03-01 18:00:07 +01001435 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001436
Felix Fietkauef0621e2013-04-22 16:29:31 +02001437 if (status->chains) {
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001438 sta->rx_stats.chains = status->chains;
Felix Fietkauef0621e2013-04-22 16:29:31 +02001439 for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) {
1440 int signal = status->chain_signal[i];
1441
1442 if (!(status->chains & BIT(i)))
1443 continue;
1444
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001445 sta->rx_stats.chain_signal_last[i] = signal;
1446 ewma_signal_add(&sta->rx_stats.chain_signal_avg[i],
1447 -signal);
Felix Fietkauef0621e2013-04-22 16:29:31 +02001448 }
1449 }
1450
Johannes Berg72eaa432008-11-26 15:02:58 +01001451 /*
1452 * Change STA power saving mode only at the end of a frame
1453 * exchange sequence.
1454 */
Johannes Berg30686bf2015-06-02 21:39:54 +02001455 if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) &&
Arik Nemtsovd057e5a2011-01-31 22:29:13 +02001456 !ieee80211_has_morefrags(hdr->frame_control) &&
Christian Lamparter4cfda472010-12-27 23:21:26 +01001457 !(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) &&
Johannes Berg05c914f2008-09-11 00:01:58 +02001458 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
Johannes Bergb4ba5442014-01-24 14:41:44 +01001459 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
1460 /* PM bit is only checked in frames where it isn't reserved,
1461 * in AP mode it's reserved in non-bufferable management frames
1462 * (cf. IEEE 802.11-2012 8.2.4.1.7 Power Management field)
1463 */
1464 (!ieee80211_is_mgmt(hdr->frame_control) ||
1465 ieee80211_is_bufferable_mmpdu(hdr->frame_control))) {
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001466 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Bergb4ba5442014-01-24 14:41:44 +01001467 if (!ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001468 sta_ps_end(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001469 } else {
1470 if (ieee80211_has_pm(hdr->frame_control))
Marco Porschd012a602012-10-10 12:39:50 -07001471 sta_ps_start(sta);
Johannes Berg72eaa432008-11-26 15:02:58 +01001472 }
Johannes Berg571ecf62007-07-27 15:43:22 +02001473 }
1474
Marco Porsch3f52b7e2013-01-30 18:14:08 +01001475 /* mesh power save support */
1476 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
1477 ieee80211_mps_rx_h_sta_process(sta, hdr);
1478
Johannes Berg22403de2009-10-30 12:55:03 +01001479 /*
1480 * Drop (qos-)data::nullfunc frames silently, since they
1481 * are used only to control station power saving mode.
1482 */
1483 if (ieee80211_is_nullfunc(hdr->frame_control) ||
1484 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001485 I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
Felix Fietkaud5242152010-01-08 18:06:26 +01001486
1487 /*
1488 * If we receive a 4-addr nullfunc frame from a STA
Johannes Berge7f4a942011-11-04 11:18:20 +01001489 * that was not moved to a 4-addr STA vlan yet send
1490 * the event to userspace and for older hostapd drop
1491 * the frame to the monitor interface.
Felix Fietkaud5242152010-01-08 18:06:26 +01001492 */
1493 if (ieee80211_has_a4(hdr->frame_control) &&
1494 (rx->sdata->vif.type == NL80211_IFTYPE_AP ||
1495 (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
Johannes Berge7f4a942011-11-04 11:18:20 +01001496 !rx->sdata->u.vlan.sta))) {
1497 if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT))
1498 cfg80211_rx_unexpected_4addr_frame(
1499 rx->sdata->dev, sta->sta.addr,
1500 GFP_ATOMIC);
Felix Fietkaud5242152010-01-08 18:06:26 +01001501 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01001502 }
Johannes Berg22403de2009-10-30 12:55:03 +01001503 /*
1504 * Update counter and free packet here to avoid
1505 * counting this as a dropped packed.
1506 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001507 sta->rx_stats.packets++;
Johannes Berg571ecf62007-07-27 15:43:22 +02001508 dev_kfree_skb(rx->skb);
Johannes Berg9ae54c82008-01-31 19:48:20 +01001509 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001510 }
1511
Johannes Berg9ae54c82008-01-31 19:48:20 +01001512 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001513} /* ieee80211_rx_h_sta_process */
1514
Johan Almbladh86c228a2013-08-14 15:29:46 +02001515static ieee80211_rx_result debug_noinline
1516ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
1517{
1518 struct sk_buff *skb = rx->skb;
1519 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1520 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1521 int keyidx;
1522 int hdrlen;
1523 ieee80211_rx_result result = RX_DROP_UNUSABLE;
1524 struct ieee80211_key *sta_ptk = NULL;
1525 int mmie_keyidx = -1;
1526 __le16 fc;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001527 const struct ieee80211_cipher_scheme *cs = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001528
1529 /*
1530 * Key selection 101
1531 *
1532 * There are four types of keys:
1533 * - GTK (group keys)
1534 * - IGTK (group keys for management frames)
1535 * - PTK (pairwise keys)
1536 * - STK (station-to-station pairwise keys)
1537 *
1538 * When selecting a key, we have to distinguish between multicast
1539 * (including broadcast) and unicast frames, the latter can only
1540 * use PTKs and STKs while the former always use GTKs and IGTKs.
1541 * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
1542 * unicast frames can also use key indices like GTKs. Hence, if we
1543 * don't have a PTK/STK we check the key index for a WEP key.
1544 *
1545 * Note that in a regular BSS, multicast frames are sent by the
1546 * AP only, associated stations unicast the frame to the AP first
1547 * which then multicasts it on their behalf.
1548 *
1549 * There is also a slight problem in IBSS mode: GTKs are negotiated
1550 * with each station, that is something we don't currently handle.
1551 * The spec seems to expect that one negotiates the same key with
1552 * every station but there's no such requirement; VLANs could be
1553 * possible.
1554 */
1555
Johan Almbladh86c228a2013-08-14 15:29:46 +02001556 /* start without a key */
1557 rx->key = NULL;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001558 fc = hdr->frame_control;
1559
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001560 if (rx->sta) {
1561 int keyid = rx->sta->ptk_idx;
1562
1563 if (ieee80211_has_protected(fc) && rx->sta->cipher_scheme) {
1564 cs = rx->sta->cipher_scheme;
1565 keyid = iwl80211_get_cs_keyid(cs, rx->skb);
1566 if (unlikely(keyid < 0))
1567 return RX_DROP_UNUSABLE;
1568 }
1569 sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);
1570 }
1571
Johan Almbladh86c228a2013-08-14 15:29:46 +02001572 if (!ieee80211_has_protected(fc))
1573 mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb);
1574
1575 if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) {
1576 rx->key = sta_ptk;
1577 if ((status->flag & RX_FLAG_DECRYPTED) &&
1578 (status->flag & RX_FLAG_IV_STRIPPED))
1579 return RX_CONTINUE;
1580 /* Skip decryption if the frame is not protected. */
1581 if (!ieee80211_has_protected(fc))
1582 return RX_CONTINUE;
1583 } else if (mmie_keyidx >= 0) {
1584 /* Broadcast/multicast robust management frame / BIP */
1585 if ((status->flag & RX_FLAG_DECRYPTED) &&
1586 (status->flag & RX_FLAG_IV_STRIPPED))
1587 return RX_CONTINUE;
1588
1589 if (mmie_keyidx < NUM_DEFAULT_KEYS ||
1590 mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
1591 return RX_DROP_MONITOR; /* unexpected BIP keyidx */
1592 if (rx->sta)
1593 rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]);
1594 if (!rx->key)
1595 rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]);
1596 } else if (!ieee80211_has_protected(fc)) {
1597 /*
1598 * The frame was not protected, so skip decryption. However, we
1599 * need to set rx->key if there is a key that could have been
1600 * used so that the frame may be dropped if encryption would
1601 * have been expected.
1602 */
1603 struct ieee80211_key *key = NULL;
1604 struct ieee80211_sub_if_data *sdata = rx->sdata;
1605 int i;
1606
1607 if (ieee80211_is_mgmt(fc) &&
1608 is_multicast_ether_addr(hdr->addr1) &&
1609 (key = rcu_dereference(rx->sdata->default_mgmt_key)))
1610 rx->key = key;
1611 else {
1612 if (rx->sta) {
1613 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1614 key = rcu_dereference(rx->sta->gtk[i]);
1615 if (key)
1616 break;
1617 }
1618 }
1619 if (!key) {
1620 for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
1621 key = rcu_dereference(sdata->keys[i]);
1622 if (key)
1623 break;
1624 }
1625 }
1626 if (key)
1627 rx->key = key;
1628 }
1629 return RX_CONTINUE;
1630 } else {
1631 u8 keyid;
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001632
Johan Almbladh86c228a2013-08-14 15:29:46 +02001633 /*
1634 * The device doesn't give us the IV so we won't be
1635 * able to look up the key. That's ok though, we
1636 * don't need to decrypt the frame, we just won't
1637 * be able to keep statistics accurate.
1638 * Except for key threshold notifications, should
1639 * we somehow allow the driver to tell us which key
1640 * the hardware used if this flag is set?
1641 */
1642 if ((status->flag & RX_FLAG_DECRYPTED) &&
1643 (status->flag & RX_FLAG_IV_STRIPPED))
1644 return RX_CONTINUE;
1645
1646 hdrlen = ieee80211_hdrlen(fc);
1647
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001648 if (cs) {
1649 keyidx = iwl80211_get_cs_keyid(cs, rx->skb);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001650
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001651 if (unlikely(keyidx < 0))
1652 return RX_DROP_UNUSABLE;
1653 } else {
1654 if (rx->skb->len < 8 + hdrlen)
1655 return RX_DROP_UNUSABLE; /* TODO: count this? */
1656 /*
1657 * no need to call ieee80211_wep_get_keyidx,
1658 * it verifies a bunch of things we've done already
1659 */
1660 skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1);
1661 keyidx = keyid >> 6;
1662 }
Johan Almbladh86c228a2013-08-14 15:29:46 +02001663
1664 /* check per-station GTK first, if multicast packet */
1665 if (is_multicast_ether_addr(hdr->addr1) && rx->sta)
1666 rx->key = rcu_dereference(rx->sta->gtk[keyidx]);
1667
1668 /* if not found, try default key */
1669 if (!rx->key) {
1670 rx->key = rcu_dereference(rx->sdata->keys[keyidx]);
1671
1672 /*
1673 * RSNA-protected unicast frames should always be
1674 * sent with pairwise or station-to-station keys,
1675 * but for WEP we allow using a key index as well.
1676 */
1677 if (rx->key &&
1678 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 &&
1679 rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 &&
1680 !is_multicast_ether_addr(hdr->addr1))
1681 rx->key = NULL;
1682 }
1683 }
1684
1685 if (rx->key) {
1686 if (unlikely(rx->key->flags & KEY_FLAG_TAINTED))
1687 return RX_DROP_MONITOR;
1688
Johan Almbladh86c228a2013-08-14 15:29:46 +02001689 /* TODO: add threshold stuff again */
1690 } else {
1691 return RX_DROP_MONITOR;
1692 }
1693
1694 switch (rx->key->conf.cipher) {
1695 case WLAN_CIPHER_SUITE_WEP40:
1696 case WLAN_CIPHER_SUITE_WEP104:
1697 result = ieee80211_crypto_wep_decrypt(rx);
1698 break;
1699 case WLAN_CIPHER_SUITE_TKIP:
1700 result = ieee80211_crypto_tkip_decrypt(rx);
1701 break;
1702 case WLAN_CIPHER_SUITE_CCMP:
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001703 result = ieee80211_crypto_ccmp_decrypt(
1704 rx, IEEE80211_CCMP_MIC_LEN);
1705 break;
1706 case WLAN_CIPHER_SUITE_CCMP_256:
1707 result = ieee80211_crypto_ccmp_decrypt(
1708 rx, IEEE80211_CCMP_256_MIC_LEN);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001709 break;
1710 case WLAN_CIPHER_SUITE_AES_CMAC:
1711 result = ieee80211_crypto_aes_cmac_decrypt(rx);
1712 break;
Jouni Malinen56c52da2015-01-24 19:52:08 +02001713 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1714 result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
1715 break;
Jouni Malinen8ade5382015-01-24 19:52:09 +02001716 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1717 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1718 result = ieee80211_crypto_aes_gmac_decrypt(rx);
1719 break;
Jouni Malinen00b9cfa2015-01-24 19:52:06 +02001720 case WLAN_CIPHER_SUITE_GCMP:
1721 case WLAN_CIPHER_SUITE_GCMP_256:
1722 result = ieee80211_crypto_gcmp_decrypt(rx);
1723 break;
Johan Almbladh86c228a2013-08-14 15:29:46 +02001724 default:
Max Stepanov2475b1cc2013-03-24 14:23:27 +02001725 result = ieee80211_crypto_hw_decrypt(rx);
Johan Almbladh86c228a2013-08-14 15:29:46 +02001726 }
1727
1728 /* the hdr variable is invalid after the decrypt handlers */
1729
1730 /* either the frame has been decrypted or will be dropped */
1731 status->flag |= RX_FLAG_DECRYPTED;
1732
1733 return result;
1734}
1735
Johannes Berg571ecf62007-07-27 15:43:22 +02001736static inline struct ieee80211_fragment_entry *
1737ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
1738 unsigned int frag, unsigned int seq, int rx_queue,
1739 struct sk_buff **skb)
1740{
1741 struct ieee80211_fragment_entry *entry;
Johannes Berg571ecf62007-07-27 15:43:22 +02001742
Johannes Berg571ecf62007-07-27 15:43:22 +02001743 entry = &sdata->fragments[sdata->fragment_next++];
1744 if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX)
1745 sdata->fragment_next = 0;
1746
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02001747 if (!skb_queue_empty(&entry->skb_list))
Johannes Berg571ecf62007-07-27 15:43:22 +02001748 __skb_queue_purge(&entry->skb_list);
Johannes Berg571ecf62007-07-27 15:43:22 +02001749
1750 __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */
1751 *skb = NULL;
1752 entry->first_frag_time = jiffies;
1753 entry->seq = seq;
1754 entry->rx_queue = rx_queue;
1755 entry->last_frag = frag;
1756 entry->ccmp = 0;
1757 entry->extra_len = 0;
1758
1759 return entry;
1760}
1761
1762static inline struct ieee80211_fragment_entry *
1763ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001764 unsigned int frag, unsigned int seq,
Johannes Berg571ecf62007-07-27 15:43:22 +02001765 int rx_queue, struct ieee80211_hdr *hdr)
1766{
1767 struct ieee80211_fragment_entry *entry;
1768 int i, idx;
1769
1770 idx = sdata->fragment_next;
1771 for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
1772 struct ieee80211_hdr *f_hdr;
Johannes Berg571ecf62007-07-27 15:43:22 +02001773
1774 idx--;
1775 if (idx < 0)
1776 idx = IEEE80211_FRAGMENT_MAX - 1;
1777
1778 entry = &sdata->fragments[idx];
1779 if (skb_queue_empty(&entry->skb_list) || entry->seq != seq ||
1780 entry->rx_queue != rx_queue ||
1781 entry->last_frag + 1 != frag)
1782 continue;
1783
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001784 f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001785
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001786 /*
1787 * Check ftype and addresses are equal, else check next fragment
1788 */
1789 if (((hdr->frame_control ^ f_hdr->frame_control) &
1790 cpu_to_le16(IEEE80211_FCTL_FTYPE)) ||
Joe Perchesb203ca32012-05-08 18:56:52 +00001791 !ether_addr_equal(hdr->addr1, f_hdr->addr1) ||
1792 !ether_addr_equal(hdr->addr2, f_hdr->addr2))
Johannes Berg571ecf62007-07-27 15:43:22 +02001793 continue;
1794
S.Çağlar Onurab466232008-02-14 17:36:47 +02001795 if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001796 __skb_queue_purge(&entry->skb_list);
1797 continue;
1798 }
1799 return entry;
1800 }
1801
1802 return NULL;
1803}
1804
Johannes Berg49461622008-06-30 15:10:45 +02001805static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01001806ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001807{
1808 struct ieee80211_hdr *hdr;
1809 u16 sc;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001810 __le16 fc;
Johannes Berg571ecf62007-07-27 15:43:22 +02001811 unsigned int frag, seq;
1812 struct ieee80211_fragment_entry *entry;
1813 struct sk_buff *skb;
Johannes Berg554891e2010-09-24 12:38:25 +02001814 struct ieee80211_rx_status *status;
Johannes Berg571ecf62007-07-27 15:43:22 +02001815
Harvey Harrisonb73d70a2008-07-15 18:44:12 -07001816 hdr = (struct ieee80211_hdr *)rx->skb->data;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001817 fc = hdr->frame_control;
Javier Cardonaf7fbf702012-10-25 11:10:18 -07001818
1819 if (ieee80211_is_ctl(fc))
1820 return RX_CONTINUE;
1821
Johannes Berg571ecf62007-07-27 15:43:22 +02001822 sc = le16_to_cpu(hdr->seq_ctrl);
1823 frag = sc & IEEE80211_SCTL_FRAG;
1824
Johannes Bergb8fff402014-11-03 13:57:46 +01001825 if (is_multicast_ether_addr(hdr->addr1)) {
Johannes Bergc206ca62015-04-22 20:47:28 +02001826 I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount);
Andreas Müllerd0259332014-12-12 12:11:11 +01001827 goto out_no_led;
Johannes Berg571ecf62007-07-27 15:43:22 +02001828 }
Johannes Bergb8fff402014-11-03 13:57:46 +01001829
Andreas Müllerd0259332014-12-12 12:11:11 +01001830 if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
1831 goto out;
1832
Johannes Berg571ecf62007-07-27 15:43:22 +02001833 I802_DEBUG_INC(rx->local->rx_handlers_fragments);
1834
Zhu Yie3cf8b32010-03-29 17:35:07 +08001835 if (skb_linearize(rx->skb))
1836 return RX_DROP_UNUSABLE;
1837
Abhijeet Kolekar058897a2010-05-11 11:22:11 -07001838 /*
1839 * skb_linearize() might change the skb->data and
1840 * previously cached variables (in this case, hdr) need to
1841 * be refreshed with the new data.
1842 */
1843 hdr = (struct ieee80211_hdr *)rx->skb->data;
Johannes Berg571ecf62007-07-27 15:43:22 +02001844 seq = (sc & IEEE80211_SCTL_SEQ) >> 4;
1845
1846 if (frag == 0) {
1847 /* This is the first fragment of a new frame. */
1848 entry = ieee80211_reassemble_add(rx->sdata, frag, seq,
Johannes Berg9e262972011-07-07 18:45:03 +02001849 rx->seqno_idx, &(rx->skb));
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001850 if (rx->key &&
1851 (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
1852 rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
Harvey Harrison358c8d92008-07-15 18:44:13 -07001853 ieee80211_has_protected(fc)) {
Johannes Berg9e262972011-07-07 18:45:03 +02001854 int queue = rx->security_idx;
Johannes Berg571ecf62007-07-27 15:43:22 +02001855 /* Store CCMP PN so that we can verify that the next
1856 * fragment has a sequential PN value. */
1857 entry->ccmp = 1;
1858 memcpy(entry->last_pn,
Jouni Malinen91902522010-06-11 10:27:33 -07001859 rx->key->u.ccmp.rx_pn[queue],
Johannes Berg4325f6c2013-05-08 13:09:08 +02001860 IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001861 }
Johannes Berg9ae54c82008-01-31 19:48:20 +01001862 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001863 }
1864
1865 /* This is a fragment for a frame that should already be pending in
1866 * fragment cache. Add this fragment to the end of the pending entry.
1867 */
Johannes Berg9e262972011-07-07 18:45:03 +02001868 entry = ieee80211_reassemble_find(rx->sdata, frag, seq,
1869 rx->seqno_idx, hdr);
Johannes Berg571ecf62007-07-27 15:43:22 +02001870 if (!entry) {
1871 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001872 return RX_DROP_MONITOR;
Johannes Berg571ecf62007-07-27 15:43:22 +02001873 }
1874
1875 /* Verify that MPDUs within one MSDU have sequential PN values.
1876 * (IEEE 802.11i, 8.3.3.4.5) */
1877 if (entry->ccmp) {
1878 int i;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001879 u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
Jouni Malinen91902522010-06-11 10:27:33 -07001880 int queue;
Jouni Malinen2b2ba0d2015-01-24 19:52:07 +02001881 if (!rx->key ||
1882 (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
1883 rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001884 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001885 memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
1886 for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001887 pn[i]++;
1888 if (pn[i])
1889 break;
1890 }
Johannes Berg9e262972011-07-07 18:45:03 +02001891 queue = rx->security_idx;
Jouni Malinen91902522010-06-11 10:27:33 -07001892 rpn = rx->key->u.ccmp.rx_pn[queue];
Johannes Berg4325f6c2013-05-08 13:09:08 +02001893 if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN))
Johannes Berge4c26ad2008-01-31 19:48:21 +01001894 return RX_DROP_UNUSABLE;
Johannes Berg4325f6c2013-05-08 13:09:08 +02001895 memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN);
Johannes Berg571ecf62007-07-27 15:43:22 +02001896 }
1897
Harvey Harrison358c8d92008-07-15 18:44:13 -07001898 skb_pull(rx->skb, ieee80211_hdrlen(fc));
Johannes Berg571ecf62007-07-27 15:43:22 +02001899 __skb_queue_tail(&entry->skb_list, rx->skb);
1900 entry->last_frag = frag;
1901 entry->extra_len += rx->skb->len;
Harvey Harrison358c8d92008-07-15 18:44:13 -07001902 if (ieee80211_has_morefrags(fc)) {
Johannes Berg571ecf62007-07-27 15:43:22 +02001903 rx->skb = NULL;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001904 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02001905 }
1906
1907 rx->skb = __skb_dequeue(&entry->skb_list);
1908 if (skb_tailroom(rx->skb) < entry->extra_len) {
Johannes Bergf1160432015-04-22 20:25:20 +02001909 I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag);
Johannes Berg571ecf62007-07-27 15:43:22 +02001910 if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len,
1911 GFP_ATOMIC))) {
1912 I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
1913 __skb_queue_purge(&entry->skb_list);
Johannes Berge4c26ad2008-01-31 19:48:21 +01001914 return RX_DROP_UNUSABLE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001915 }
1916 }
1917 while ((skb = __skb_dequeue(&entry->skb_list))) {
1918 memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len);
1919 dev_kfree_skb(skb);
1920 }
1921
1922 /* Complete frame has been reassembled - process it now */
Johannes Berg554891e2010-09-24 12:38:25 +02001923 status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02001924
1925 out:
Andreas Müllerd0259332014-12-12 12:11:11 +01001926 ieee80211_led_rx(rx->local);
1927 out_no_led:
Johannes Berg571ecf62007-07-27 15:43:22 +02001928 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02001929 rx->sta->rx_stats.packets++;
Johannes Berg9ae54c82008-01-31 19:48:20 +01001930 return RX_CONTINUE;
Johannes Berg571ecf62007-07-27 15:43:22 +02001931}
1932
Johannes Berg1df332e2012-10-26 00:09:11 +02001933static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02001934{
Johannes Berg1df332e2012-10-26 00:09:11 +02001935 if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED)))
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001936 return -EACCES;
Johannes Berg571ecf62007-07-27 15:43:22 +02001937
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001938 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001939}
1940
Johannes Berg1df332e2012-10-26 00:09:11 +02001941static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Berg571ecf62007-07-27 15:43:22 +02001942{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001943 struct sk_buff *skb = rx->skb;
1944 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1945
Johannes Berg3017b802007-08-28 17:01:53 -04001946 /*
Johannes Berg7848ba72007-09-14 11:10:25 -04001947 * Pass through unencrypted frames if the hardware has
1948 * decrypted them already.
Johannes Berg3017b802007-08-28 17:01:53 -04001949 */
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01001950 if (status->flag & RX_FLAG_DECRYPTED)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02001951 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02001952
1953 /* Drop unencrypted frames if key is set. */
Harvey Harrison358c8d92008-07-15 18:44:13 -07001954 if (unlikely(!ieee80211_has_protected(fc) &&
1955 !ieee80211_is_nullfunc(fc) &&
Johannes Berge8f4fb72015-03-20 11:37:36 +01001956 ieee80211_is_data(fc) && rx->key))
Jouni Malinen3cfcf6ac2009-01-08 13:32:02 +02001957 return -EACCES;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001958
1959 return 0;
1960}
1961
Johannes Berg1df332e2012-10-26 00:09:11 +02001962static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001963{
1964 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Jouni Malinene3efca02010-03-28 22:31:15 -07001965 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001966 __le16 fc = hdr->frame_control;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001967
Jouni Malinene3efca02010-03-28 22:31:15 -07001968 /*
1969 * Pass through unencrypted frames if the hardware has
1970 * decrypted them already.
1971 */
1972 if (status->flag & RX_FLAG_DECRYPTED)
1973 return 0;
Johannes Bergbef5d1c2010-02-16 11:05:00 +01001974
Johannes Bergc2c98fd2011-09-29 16:04:36 +02001975 if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) {
Jouni Malinend211e902010-03-28 22:29:52 -07001976 if (unlikely(!ieee80211_has_protected(fc) &&
1977 ieee80211_is_unicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001978 rx->key)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001979 if (ieee80211_is_deauth(fc) ||
1980 ieee80211_is_disassoc(fc))
1981 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1982 rx->skb->data,
1983 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001984 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001985 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001986 /* BIP does not use Protected field, so need to check MMIE */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001987 if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) &&
Jouni Malinencf4e5942010-12-16 00:52:40 +02001988 ieee80211_get_mmie_keyidx(rx->skb) < 0)) {
Johannes Berg6ff57cf2013-05-16 00:55:00 +02001989 if (ieee80211_is_deauth(fc) ||
1990 ieee80211_is_disassoc(fc))
1991 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
1992 rx->skb->data,
1993 rx->skb->len);
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001994 return -EACCES;
Jouni Malinencf4e5942010-12-16 00:52:40 +02001995 }
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03001996 /*
1997 * When using MFP, Action frames are not allowed prior to
1998 * having configured keys.
1999 */
2000 if (unlikely(ieee80211_is_action(fc) && !rx->key &&
Johannes Bergd8ca16d2014-01-23 16:20:29 +01002001 ieee80211_is_robust_mgmt_frame(rx->skb)))
Jouni Malinenf2ca3ea2009-05-08 12:36:03 +03002002 return -EACCES;
2003 }
Johannes Bergb3fc9c62008-04-13 10:12:47 +02002004
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002005 return 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02002006}
2007
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002008static int
Felix Fietkau4114fa22011-04-12 19:15:22 +02002009__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
Johannes Berg571ecf62007-07-27 15:43:22 +02002010{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002011 struct ieee80211_sub_if_data *sdata = rx->sdata;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002013 bool check_port_control = false;
2014 struct ethhdr *ehdr;
2015 int ret;
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002016
Felix Fietkau4114fa22011-04-12 19:15:22 +02002017 *port_control = false;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002018 if (ieee80211_has_a4(hdr->frame_control) &&
2019 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002020 return -1;
Johannes Berg9bc383d2009-11-19 11:55:19 +01002021
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002022 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2023 !!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) {
2024
2025 if (!sdata->u.mgd.use_4addr)
2026 return -1;
2027 else
2028 check_port_control = true;
2029 }
2030
Johannes Berg9bc383d2009-11-19 11:55:19 +01002031 if (is_multicast_ether_addr(hdr->addr1) &&
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002032 sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta)
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002033 return -1;
Johannes Berg571ecf62007-07-27 15:43:22 +02002034
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002035 ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type);
Felix Fietkau4114fa22011-04-12 19:15:22 +02002036 if (ret < 0)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002037 return ret;
2038
2039 ehdr = (struct ethhdr *) rx->skb->data;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002040 if (ehdr->h_proto == rx->sdata->control_port_protocol)
2041 *port_control = true;
2042 else if (check_port_control)
Felix Fietkaufbb327c2011-01-18 15:48:48 +01002043 return -1;
2044
2045 return 0;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002046}
Johannes Berg571ecf62007-07-27 15:43:22 +02002047
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002048/*
2049 * requires that rx->skb is a frame with ethernet header
2050 */
Harvey Harrison358c8d92008-07-15 18:44:13 -07002051static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002052{
Senthil Balasubramanianc97c23e2008-05-28 23:15:32 +05302053 static const u8 pae_group_addr[ETH_ALEN] __aligned(2)
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002054 = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 };
2055 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2056
2057 /*
2058 * Allow EAPOL frames to us/the PAE group address regardless
2059 * of whether the frame was encrypted or not.
2060 */
Johannes Berga621fa42010-08-27 14:26:54 +03002061 if (ehdr->h_proto == rx->sdata->control_port_protocol &&
Joe Perches3bc79452012-05-08 18:56:53 +00002062 (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) ||
2063 ether_addr_equal(ehdr->h_dest, pae_group_addr)))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002064 return true;
2065
2066 if (ieee80211_802_1x_port_control(rx) ||
Harvey Harrison358c8d92008-07-15 18:44:13 -07002067 ieee80211_drop_unencrypted(rx, fc))
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002068 return false;
2069
2070 return true;
2071}
2072
2073/*
2074 * requires that rx->skb is a frame with ethernet header
2075 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002076static void
Johannes Berg5cf121c2008-02-25 16:27:43 +01002077ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002078{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002079 struct ieee80211_sub_if_data *sdata = rx->sdata;
2080 struct net_device *dev = sdata->dev;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002081 struct sk_buff *skb, *xmit_skb;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002082 struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data;
2083 struct sta_info *dsta;
Johannes Berg571ecf62007-07-27 15:43:22 +02002084
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002085 skb = rx->skb;
2086 xmit_skb = NULL;
Johannes Berg571ecf62007-07-27 15:43:22 +02002087
Johannes Berg5a490512015-04-22 17:10:38 +02002088 ieee80211_rx_stats(dev, skb->len);
2089
Johannes Berg05c914f2008-09-11 00:01:58 +02002090 if ((sdata->vif.type == NL80211_IFTYPE_AP ||
2091 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) &&
Johannes Berg213cd112008-09-11 00:01:54 +02002092 !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) &&
Johannes Berg9bc383d2009-11-19 11:55:19 +01002093 (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002094 if (is_multicast_ether_addr(ehdr->h_dest)) {
2095 /*
2096 * send multicast frames both to higher layers in
2097 * local net stack and back to the wireless medium
2098 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002099 xmit_skb = skb_copy(skb, GFP_ATOMIC);
Joe Perchese87cc472012-05-13 21:56:26 +00002100 if (!xmit_skb)
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002101 net_info_ratelimited("%s: failed to clone multicast frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002102 dev->name);
Johannes Berg571ecf62007-07-27 15:43:22 +02002103 } else {
Johannes Bergabe60632009-11-25 17:46:18 +01002104 dsta = sta_info_get(sdata, skb->data);
2105 if (dsta) {
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002106 /*
2107 * The destination station is associated to
2108 * this AP (in this VLAN), so send the frame
2109 * directly to it and do not pass it to local
2110 * net stack.
Johannes Berg571ecf62007-07-27 15:43:22 +02002111 */
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002112 xmit_skb = skb;
Johannes Berg571ecf62007-07-27 15:43:22 +02002113 skb = NULL;
2114 }
Johannes Berg571ecf62007-07-27 15:43:22 +02002115 }
2116 }
2117
Kalle Valo59d9cb02009-12-17 13:54:57 +01002118#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002119 if (skb) {
2120 /* 'align' will only take the values 0 or 2 here since all
2121 * frames are required to be aligned to 2-byte boundaries
2122 * when being passed to mac80211; the code here works just
2123 * as well if that isn't true, but mac80211 assumes it can
2124 * access fields as 2-byte aligned (e.g. for ether_addr_equal)
Johannes Bergd1c3a372009-01-07 00:26:10 +01002125 */
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002126 int align;
2127
2128 align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3;
Johannes Bergd1c3a372009-01-07 00:26:10 +01002129 if (align) {
2130 if (WARN_ON(skb_headroom(skb) < 3)) {
2131 dev_kfree_skb(skb);
2132 skb = NULL;
2133 } else {
2134 u8 *data = skb->data;
Zhu Yi8ce0b582009-10-28 13:13:52 -07002135 size_t len = skb_headlen(skb);
2136 skb->data -= align;
2137 memmove(skb->data, data, len);
2138 skb_set_tail_pointer(skb, len);
Johannes Bergd1c3a372009-01-07 00:26:10 +01002139 }
2140 }
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002141 }
Johannes Bergd1c3a372009-01-07 00:26:10 +01002142#endif
2143
Johannes Berg9e890a1f2013-12-04 09:16:31 +01002144 if (skb) {
2145 /* deliver to local stack */
2146 skb->protocol = eth_type_trans(skb, dev);
2147 memset(skb->cb, 0, sizeof(skb->cb));
Johannes Bergaf9f9b22015-06-11 16:02:32 +02002148 if (rx->napi)
2149 napi_gro_receive(rx->napi, skb);
Johannes Berg06d181a2014-02-04 20:51:09 +01002150 else
2151 netif_receive_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002152 }
2153
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002154 if (xmit_skb) {
Helmut Schaaaef6c922011-12-21 09:11:35 +01002155 /*
2156 * Send to wireless media and increase priority by 256 to
2157 * keep the received priority instead of reclassifying
2158 * the frame (see cfg80211_classify8021d).
2159 */
2160 xmit_skb->priority += 256;
YOSHIFUJI Hideakif831e902007-12-12 03:54:23 +09002161 xmit_skb->protocol = htons(ETH_P_802_3);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002162 skb_reset_network_header(xmit_skb);
2163 skb_reset_mac_header(xmit_skb);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002164 dev_queue_xmit(xmit_skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02002165 }
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002166}
2167
Johannes Berg49461622008-06-30 15:10:45 +02002168static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002169ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx)
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002170{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002171 struct net_device *dev = rx->sdata->dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002172 struct sk_buff *skb = rx->skb;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002173 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2174 __le16 fc = hdr->frame_control;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002175 struct sk_buff_head frame_list;
Johannes Berg554891e2010-09-24 12:38:25 +02002176 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002177
Harvey Harrison358c8d92008-07-15 18:44:13 -07002178 if (unlikely(!ieee80211_is_data(fc)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002179 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002180
Harvey Harrison358c8d92008-07-15 18:44:13 -07002181 if (unlikely(!ieee80211_is_data_present(fc)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002182 return RX_DROP_MONITOR;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002183
Johannes Berg554891e2010-09-24 12:38:25 +02002184 if (!(status->rx_flags & IEEE80211_RX_AMSDU))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002185 return RX_CONTINUE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002186
Zhu Yieaf85ca2009-12-01 10:18:37 +08002187 if (ieee80211_has_a4(hdr->frame_control) &&
2188 rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2189 !rx->sdata->u.vlan.sta)
2190 return RX_DROP_UNUSABLE;
2191
2192 if (is_multicast_ether_addr(hdr->addr1) &&
2193 ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2194 rx->sdata->u.vlan.sta) ||
2195 (rx->sdata->vif.type == NL80211_IFTYPE_STATION &&
2196 rx->sdata->u.mgd.use_4addr)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002197 return RX_DROP_UNUSABLE;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002198
2199 skb->dev = dev;
Zhu Yieaf85ca2009-12-01 10:18:37 +08002200 __skb_queue_head_init(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002201
Zhu Yie3cf8b32010-03-29 17:35:07 +08002202 if (skb_linearize(skb))
2203 return RX_DROP_UNUSABLE;
2204
Zhu Yieaf85ca2009-12-01 10:18:37 +08002205 ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr,
2206 rx->sdata->vif.type,
Yogesh Ashok Powar8b3beca2011-05-13 11:22:31 -07002207 rx->local->hw.extra_tx_headroom, true);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002208
Zhu Yieaf85ca2009-12-01 10:18:37 +08002209 while (!skb_queue_empty(&frame_list)) {
2210 rx->skb = __skb_dequeue(&frame_list);
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002211
Harvey Harrison358c8d92008-07-15 18:44:13 -07002212 if (!ieee80211_frame_allowed(rx, fc)) {
Zhu Yieaf85ca2009-12-01 10:18:37 +08002213 dev_kfree_skb(rx->skb);
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002214 continue;
2215 }
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002216
2217 ieee80211_deliver_skb(rx);
2218 }
2219
Johannes Berg9ae54c82008-01-31 19:48:20 +01002220 return RX_QUEUED;
Ron Rindjunskyfd4c7f22007-11-26 16:14:33 +02002221}
2222
Ingo Molnarbf94e172008-10-12 23:51:38 -07002223#ifdef CONFIG_MAC80211_MESH
Davide Pesaventob0dee572008-09-27 17:29:12 +02002224static ieee80211_rx_result
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002225ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
2226{
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002227 struct ieee80211_hdr *fwd_hdr, *hdr;
2228 struct ieee80211_tx_info *info;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002229 struct ieee80211s_hdr *mesh_hdr;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002230 struct sk_buff *skb = rx->skb, *fwd_skb;
Johannes Berg3b8d81e02009-06-17 17:43:56 +02002231 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002232 struct ieee80211_sub_if_data *sdata = rx->sdata;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002233 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002234 u16 q, hdrlen;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002235
2236 hdr = (struct ieee80211_hdr *) skb->data;
2237 hdrlen = ieee80211_hdrlen(hdr->frame_control);
Johannes Berg9b395bc2012-10-26 00:36:40 +02002238
2239 /* make sure fixed part of mesh header is there, also checks skb len */
2240 if (!pskb_may_pull(rx->skb, hdrlen + 6))
2241 return RX_DROP_MONITOR;
2242
2243 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2244
2245 /* make sure full mesh header is there, also checks skb len */
2246 if (!pskb_may_pull(rx->skb,
2247 hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
2248 return RX_DROP_MONITOR;
2249
2250 /* reload pointers */
2251 hdr = (struct ieee80211_hdr *) skb->data;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002252 mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
2253
Bob Copelandd0c22112015-03-02 14:28:52 -05002254 if (ieee80211_drop_unencrypted(rx, hdr->frame_control))
2255 return RX_DROP_MONITOR;
2256
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002257 /* frame is in RMC, don't forward */
2258 if (ieee80211_is_data(hdr->frame_control) &&
2259 is_multicast_ether_addr(hdr->addr1) &&
Johannes Bergbf7cd942013-02-15 14:40:31 +01002260 mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr))
Thomas Pedersen2157fdd2011-09-01 12:32:14 -07002261 return RX_DROP_MONITOR;
2262
Johannes Berg5c900672015-04-22 14:48:34 +02002263 if (!ieee80211_is_data(hdr->frame_control))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002264 return RX_CONTINUE;
2265
2266 if (!mesh_hdr->ttl)
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002267 return RX_DROP_MONITOR;
2268
Javier Cardona43b7b312009-10-15 18:10:51 -07002269 if (mesh_hdr->flags & MESH_FLAGS_AE) {
YanBo79617de2008-09-22 13:30:32 +08002270 struct mesh_path *mppath;
Javier Cardona43b7b312009-10-15 18:10:51 -07002271 char *proxied_addr;
2272 char *mpp_addr;
2273
2274 if (is_multicast_ether_addr(hdr->addr1)) {
2275 mpp_addr = hdr->addr3;
2276 proxied_addr = mesh_hdr->eaddr1;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002277 } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
2278 /* has_a4 already checked in ieee80211_rx_mesh_check */
Javier Cardona43b7b312009-10-15 18:10:51 -07002279 mpp_addr = hdr->addr4;
2280 proxied_addr = mesh_hdr->eaddr2;
Johannes Berg9b395bc2012-10-26 00:36:40 +02002281 } else {
2282 return RX_DROP_MONITOR;
Javier Cardona43b7b312009-10-15 18:10:51 -07002283 }
YanBo79617de2008-09-22 13:30:32 +08002284
YanBo79617de2008-09-22 13:30:32 +08002285 rcu_read_lock();
Johannes Bergbf7cd942013-02-15 14:40:31 +01002286 mppath = mpp_path_lookup(sdata, proxied_addr);
YanBo79617de2008-09-22 13:30:32 +08002287 if (!mppath) {
Johannes Bergbf7cd942013-02-15 14:40:31 +01002288 mpp_path_add(sdata, proxied_addr, mpp_addr);
YanBo79617de2008-09-22 13:30:32 +08002289 } else {
2290 spin_lock_bh(&mppath->state_lock);
Joe Perchesb203ca32012-05-08 18:56:52 +00002291 if (!ether_addr_equal(mppath->mpp, mpp_addr))
Javier Cardona43b7b312009-10-15 18:10:51 -07002292 memcpy(mppath->mpp, mpp_addr, ETH_ALEN);
YanBo79617de2008-09-22 13:30:32 +08002293 spin_unlock_bh(&mppath->state_lock);
2294 }
2295 rcu_read_unlock();
2296 }
2297
Javier Cardona3c5772a2009-08-10 12:15:48 -07002298 /* Frame has reached destination. Don't forward */
2299 if (!is_multicast_ether_addr(hdr->addr1) &&
Joe Perchesb203ca32012-05-08 18:56:52 +00002300 ether_addr_equal(sdata->vif.addr, hdr->addr3))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002301 return RX_CONTINUE;
2302
Yoni Divinsky00e96de2012-06-20 15:39:13 +03002303 q = ieee80211_select_queue_80211(sdata, skb, hdr);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002304 if (ieee80211_queue_stopped(&local->hw, q)) {
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002305 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion);
Thomas Pedersend3c15972011-11-24 17:15:23 -08002306 return RX_DROP_MONITOR;
2307 }
2308 skb_set_queue_mapping(skb, q);
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002309
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002310 if (!--mesh_hdr->ttl) {
2311 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
Javier Cardona2ac64cd2012-10-24 12:43:31 -07002312 goto out;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002313 }
2314
Chun-Yeow Yeohd6655082012-03-02 02:03:19 +08002315 if (!ifmsh->mshcfg.dot11MeshForwarding)
2316 goto out;
2317
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002318 fwd_skb = skb_copy(skb, GFP_ATOMIC);
2319 if (!fwd_skb) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +02002320 net_info_ratelimited("%s: failed to clone mesh frame\n",
Joe Perchese87cc472012-05-13 21:56:26 +00002321 sdata->name);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002322 goto out;
2323 }
2324
2325 fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data;
Thomas Pedersen9d6d6f42013-04-08 11:06:12 -07002326 fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002327 info = IEEE80211_SKB_CB(fwd_skb);
2328 memset(info, 0, sizeof(*info));
2329 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
2330 info->control.vif = &rx->sdata->vif;
2331 info->control.jiffies = jiffies;
2332 if (is_multicast_ether_addr(fwd_hdr->addr1)) {
2333 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast);
2334 memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN);
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002335 /* update power mode indication when forwarding */
2336 ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr);
Johannes Bergbf7cd942013-02-15 14:40:31 +01002337 } else if (!mesh_nexthop_lookup(sdata, fwd_skb)) {
Marco Porsch3f52b7e2013-01-30 18:14:08 +01002338 /* mesh power mode flags updated in mesh_nexthop_lookup */
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002339 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast);
2340 } else {
2341 /* unable to resolve next hop */
Johannes Bergbf7cd942013-02-15 14:40:31 +01002342 mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl,
Chun-Yeow Yeohf63f8422013-11-13 15:39:12 +08002343 fwd_hdr->addr3, 0,
2344 WLAN_REASON_MESH_PATH_NOFORWARD,
2345 fwd_hdr->addr2);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002346 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route);
Jesper Juhl74b8cc32012-01-14 21:52:17 +01002347 kfree_skb(fwd_skb);
Thomas Pedersen30789eb2011-11-24 17:15:26 -08002348 return RX_DROP_MONITOR;
2349 }
2350
2351 IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames);
2352 ieee80211_add_pending_skb(local, fwd_skb);
Johannes Bergb51aff02010-12-22 10:15:07 +01002353 out:
Johannes Bergdf140462015-04-22 14:40:58 +02002354 if (is_multicast_ether_addr(hdr->addr1))
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002355 return RX_CONTINUE;
Johannes Bergdf140462015-04-22 14:40:58 +02002356 return RX_DROP_MONITOR;
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002357}
Ingo Molnarbf94e172008-10-12 23:51:38 -07002358#endif
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02002359
2360static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002361ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002362{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002363 struct ieee80211_sub_if_data *sdata = rx->sdata;
Vivek Natarajane15276a2010-02-08 17:47:01 +05302364 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002365 struct net_device *dev = sdata->dev;
Harvey Harrison358c8d92008-07-15 18:44:13 -07002366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
2367 __le16 fc = hdr->frame_control;
Felix Fietkau4114fa22011-04-12 19:15:22 +02002368 bool port_control;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002369 int err;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002370
Harvey Harrison358c8d92008-07-15 18:44:13 -07002371 if (unlikely(!ieee80211_is_data(hdr->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002372 return RX_CONTINUE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002373
Harvey Harrison358c8d92008-07-15 18:44:13 -07002374 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002375 return RX_DROP_MONITOR;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002376
Johannes Berg79c892b2014-11-21 14:26:31 +01002377 if (rx->sta) {
Johannes Berg3d6dc342015-01-23 13:23:48 +01002378 /* The seqno index has the same property as needed
Johannes Berg79c892b2014-11-21 14:26:31 +01002379 * for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS
2380 * for non-QoS-data frames. Here we know it's a data
2381 * frame, so count MSDUs.
2382 */
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002383 rx->sta->rx_stats.msdu[rx->seqno_idx]++;
Johannes Berg79c892b2014-11-21 14:26:31 +01002384 }
2385
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002386 /*
Johannes Berge7f4a942011-11-04 11:18:20 +01002387 * Send unexpected-4addr-frame event to hostapd. For older versions,
2388 * also drop the frame to cooked monitor interfaces.
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002389 */
2390 if (ieee80211_has_a4(hdr->frame_control) &&
Johannes Berge7f4a942011-11-04 11:18:20 +01002391 sdata->vif.type == NL80211_IFTYPE_AP) {
2392 if (rx->sta &&
2393 !test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT))
2394 cfg80211_rx_unexpected_4addr_frame(
2395 rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC);
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002396 return RX_DROP_MONITOR;
Johannes Berge7f4a942011-11-04 11:18:20 +01002397 }
Felix Fietkauf14543ee2009-11-10 20:10:05 +01002398
Felix Fietkau4114fa22011-04-12 19:15:22 +02002399 err = __ieee80211_data_to_8023(rx, &port_control);
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002400 if (unlikely(err))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002401 return RX_DROP_UNUSABLE;
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002402
Harvey Harrison358c8d92008-07-15 18:44:13 -07002403 if (!ieee80211_frame_allowed(rx, fc))
Johannes Berge4c26ad2008-01-31 19:48:21 +01002404 return RX_DROP_MONITOR;
Johannes Bergce3edf6d02007-12-19 01:31:22 +01002405
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002406 /* directly handle TDLS channel switch requests/responses */
2407 if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto ==
2408 cpu_to_be16(ETH_P_TDLS))) {
2409 struct ieee80211_tdls_data *tf = (void *)rx->skb->data;
2410
2411 if (pskb_may_pull(rx->skb,
2412 offsetof(struct ieee80211_tdls_data, u)) &&
2413 tf->payload_type == WLAN_TDLS_SNAP_RFTYPE &&
2414 tf->category == WLAN_CATEGORY_TDLS &&
2415 (tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ||
2416 tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) {
Arik Nemtsovc8ff71e2015-07-08 15:41:45 +03002417 skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb);
2418 schedule_work(&local->tdls_chsw_work);
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002419 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002420 rx->sta->rx_stats.packets++;
Arik Nemtsov8a4d32f2014-11-09 18:50:20 +02002421
2422 return RX_QUEUED;
2423 }
2424 }
2425
Felix Fietkau4114fa22011-04-12 19:15:22 +02002426 if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
2427 unlikely(port_control) && sdata->bss) {
2428 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2429 u.ap);
2430 dev = sdata->dev;
2431 rx->sdata = sdata;
2432 }
2433
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002434 rx->skb->dev = dev;
2435
Helmut Schaa08ca9442010-11-30 12:19:34 +01002436 if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
Rajkumar Manoharan8c99f692011-02-02 22:57:53 +05302437 !is_multicast_ether_addr(
2438 ((struct ethhdr *)rx->skb->data)->h_dest) &&
2439 (!local->scanning &&
2440 !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
Vivek Natarajane15276a2010-02-08 17:47:01 +05302441 mod_timer(&local->dynamic_ps_timer, jiffies +
2442 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
2443 }
2444
Ron Rindjunsky76ee65b2007-11-22 19:49:12 +02002445 ieee80211_deliver_skb(rx);
Johannes Berg571ecf62007-07-27 15:43:22 +02002446
Johannes Berg9ae54c82008-01-31 19:48:20 +01002447 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02002448}
2449
Johannes Berg49461622008-06-30 15:10:45 +02002450static ieee80211_rx_result debug_noinline
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002451ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
Ron Rindjunsky71364712007-12-25 17:00:36 +02002452{
Ron Rindjunsky71364712007-12-25 17:00:36 +02002453 struct sk_buff *skb = rx->skb;
Harvey Harrisona7767f92008-07-02 16:30:51 -07002454 struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002455 struct tid_ampdu_rx *tid_agg_rx;
2456 u16 start_seq_num;
2457 u16 tid;
2458
Harvey Harrisona7767f92008-07-02 16:30:51 -07002459 if (likely(!ieee80211_is_ctl(bar->frame_control)))
Johannes Berg9ae54c82008-01-31 19:48:20 +01002460 return RX_CONTINUE;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002461
Harvey Harrisona7767f92008-07-02 16:30:51 -07002462 if (ieee80211_is_back_req(bar->frame_control)) {
Johannes Berg8ae59772010-05-30 14:52:58 +02002463 struct {
2464 __le16 control, start_seq_num;
2465 } __packed bar_data;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002466 struct ieee80211_event event = {
2467 .type = BAR_RX_EVENT,
2468 };
Johannes Berg8ae59772010-05-30 14:52:58 +02002469
Ron Rindjunsky71364712007-12-25 17:00:36 +02002470 if (!rx->sta)
Johannes Berga02ae752009-11-16 12:00:40 +01002471 return RX_DROP_MONITOR;
Johannes Berg8ae59772010-05-30 14:52:58 +02002472
2473 if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control),
2474 &bar_data, sizeof(bar_data)))
2475 return RX_DROP_MONITOR;
2476
Johannes Berg8ae59772010-05-30 14:52:58 +02002477 tid = le16_to_cpu(bar_data.control) >> 12;
Johannes Berga87f7362010-06-10 10:21:38 +02002478
2479 tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]);
2480 if (!tid_agg_rx)
Johannes Berga02ae752009-11-16 12:00:40 +01002481 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002482
Johannes Berg8ae59772010-05-30 14:52:58 +02002483 start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4;
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002484 event.u.ba.tid = tid;
2485 event.u.ba.ssn = start_seq_num;
2486 event.u.ba.sta = &rx->sta->sta;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002487
2488 /* reset session timer */
Johannes Berg20ad19d2009-02-10 21:25:45 +01002489 if (tid_agg_rx->timeout)
2490 mod_timer(&tid_agg_rx->session_timer,
2491 TU_TO_EXP_TIME(tid_agg_rx->timeout));
Ron Rindjunsky71364712007-12-25 17:00:36 +02002492
Johannes Bergdd318572010-11-29 11:09:16 +01002493 spin_lock(&tid_agg_rx->reorder_lock);
Johannes Berga02ae752009-11-16 12:00:40 +01002494 /* release stored frames up to start of BAR */
Johannes Bergd3b2fb52012-06-22 12:48:38 +02002495 ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx,
Christian Lamparterf9e124f2013-02-04 17:44:44 +00002496 start_seq_num, frames);
Johannes Bergdd318572010-11-29 11:09:16 +01002497 spin_unlock(&tid_agg_rx->reorder_lock);
2498
Emmanuel Grumbach63822462015-04-20 22:53:37 +03002499 drv_event_callback(rx->local, rx->sdata, &event);
2500
Johannes Berga02ae752009-11-16 12:00:40 +01002501 kfree_skb(skb);
2502 return RX_QUEUED;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002503 }
2504
Johannes Berg08daeca2010-05-30 14:53:43 +02002505 /*
2506 * After this point, we only want management frames,
2507 * so we can drop all remaining control frames to
2508 * cooked monitor interfaces.
2509 */
2510 return RX_DROP_MONITOR;
Ron Rindjunsky71364712007-12-25 17:00:36 +02002511}
2512
Jouni Malinenf4f727a2009-01-10 11:46:53 +02002513static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
2514 struct ieee80211_mgmt *mgmt,
2515 size_t len)
Jouni Malinenfea14732009-01-08 13:32:06 +02002516{
2517 struct ieee80211_local *local = sdata->local;
2518 struct sk_buff *skb;
2519 struct ieee80211_mgmt *resp;
2520
Joe Perchesb203ca32012-05-08 18:56:52 +00002521 if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) {
Jouni Malinenfea14732009-01-08 13:32:06 +02002522 /* Not to own unicast address */
2523 return;
2524 }
2525
Joe Perchesb203ca32012-05-08 18:56:52 +00002526 if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) ||
2527 !ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) {
Johannes Berg77fdaa12009-07-07 03:45:17 +02002528 /* Not from the current AP or not associated yet. */
Jouni Malinenfea14732009-01-08 13:32:06 +02002529 return;
2530 }
2531
2532 if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
2533 /* Too short SA Query request frame */
2534 return;
2535 }
2536
2537 skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
2538 if (skb == NULL)
2539 return;
2540
2541 skb_reserve(skb, local->hw.extra_tx_headroom);
2542 resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
2543 memset(resp, 0, 24);
2544 memcpy(resp->da, mgmt->sa, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +01002545 memcpy(resp->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +01002546 memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Jouni Malinenfea14732009-01-08 13:32:06 +02002547 resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2548 IEEE80211_STYPE_ACTION);
2549 skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
2550 resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
2551 resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
2552 memcpy(resp->u.action.u.sa_query.trans_id,
2553 mgmt->u.action.u.sa_query.trans_id,
2554 WLAN_SA_QUERY_TR_ID_LEN);
2555
Johannes Berg62ae67b2009-11-18 18:42:05 +01002556 ieee80211_tx_skb(sdata, skb);
Jouni Malinenfea14732009-01-08 13:32:06 +02002557}
2558
Johannes Berg49461622008-06-30 15:10:45 +02002559static ieee80211_rx_result debug_noinline
Johannes Berg2e161f72010-08-12 15:38:38 +02002560ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx)
2561{
2562 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002563 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002564
2565 /*
2566 * From here on, look only at management frames.
2567 * Data and control frames are already handled,
2568 * and unknown (reserved) frames are useless.
2569 */
2570 if (rx->skb->len < 24)
2571 return RX_DROP_MONITOR;
2572
2573 if (!ieee80211_is_mgmt(mgmt->frame_control))
2574 return RX_DROP_MONITOR;
2575
Johannes Bergee971922011-11-04 11:18:18 +01002576 if (rx->sdata->vif.type == NL80211_IFTYPE_AP &&
2577 ieee80211_is_beacon(mgmt->frame_control) &&
2578 !(rx->flags & IEEE80211_RX_BEACON_REPORTED)) {
Johannes Berg804483e2012-03-05 22:18:41 +01002579 int sig = 0;
2580
Johannes Berg30686bf2015-06-02 21:39:54 +02002581 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002582 sig = status->signal;
2583
Johannes Bergee971922011-11-04 11:18:18 +01002584 cfg80211_report_obss_beacon(rx->local->hw.wiphy,
2585 rx->skb->data, rx->skb->len,
Ben Greear37c73b52012-10-26 14:49:25 -07002586 status->freq, sig);
Johannes Bergee971922011-11-04 11:18:18 +01002587 rx->flags |= IEEE80211_RX_BEACON_REPORTED;
2588 }
2589
Johannes Berg2e161f72010-08-12 15:38:38 +02002590 if (ieee80211_drop_unencrypted_mgmt(rx))
2591 return RX_DROP_UNUSABLE;
2592
2593 return RX_CONTINUE;
2594}
2595
2596static ieee80211_rx_result debug_noinline
Johannes Bergde1ede72008-09-09 14:42:50 +02002597ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
2598{
2599 struct ieee80211_local *local = rx->local;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002600 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergde1ede72008-09-09 14:42:50 +02002601 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
Johannes Berg554891e2010-09-24 12:38:25 +02002602 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Bergde1ede72008-09-09 14:42:50 +02002603 int len = rx->skb->len;
2604
2605 if (!ieee80211_is_action(mgmt->frame_control))
2606 return RX_CONTINUE;
2607
Jouni Malinen026331c2010-02-15 12:53:10 +02002608 /* drop too small frames */
2609 if (len < IEEE80211_MIN_ACTION_SIZE)
2610 return RX_DROP_UNUSABLE;
2611
Marco Porsch815b8092012-12-05 15:04:26 -08002612 if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC &&
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002613 mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED &&
2614 mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
Johannes Berg84040802010-02-15 12:46:39 +02002615 return RX_DROP_UNUSABLE;
Johannes Bergde1ede72008-09-09 14:42:50 +02002616
Johannes Bergde1ede72008-09-09 14:42:50 +02002617 switch (mgmt->u.action.category) {
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002618 case WLAN_CATEGORY_HT:
2619 /* reject HT action frames from stations not supporting HT */
2620 if (!rx->sta->sta.ht_cap.ht_supported)
2621 goto invalid;
2622
2623 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2624 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2625 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2626 sdata->vif.type != NL80211_IFTYPE_AP &&
2627 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2628 break;
2629
Johannes Bergec61cd62012-12-28 12:12:10 +01002630 /* verify action & smps_control/chanwidth are present */
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002631 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2632 goto invalid;
2633
2634 switch (mgmt->u.action.u.ht_smps.action) {
2635 case WLAN_HT_ACTION_SMPS: {
2636 struct ieee80211_supported_band *sband;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002637 enum ieee80211_smps_mode smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002638
2639 /* convert to HT capability */
2640 switch (mgmt->u.action.u.ht_smps.smps_control) {
2641 case WLAN_HT_SMPS_CONTROL_DISABLED:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002642 smps_mode = IEEE80211_SMPS_OFF;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002643 break;
2644 case WLAN_HT_SMPS_CONTROL_STATIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002645 smps_mode = IEEE80211_SMPS_STATIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002646 break;
2647 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
Johannes Bergaf0ed692013-02-12 14:21:00 +01002648 smps_mode = IEEE80211_SMPS_DYNAMIC;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002649 break;
2650 default:
2651 goto invalid;
2652 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002653
2654 /* if no change do nothing */
Johannes Bergaf0ed692013-02-12 14:21:00 +01002655 if (rx->sta->sta.smps_mode == smps_mode)
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002656 goto handled;
Johannes Bergaf0ed692013-02-12 14:21:00 +01002657 rx->sta->sta.smps_mode = smps_mode;
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002658
2659 sband = rx->local->hw.wiphy->bands[status->band];
2660
Johannes Berg64f68e52012-03-28 10:58:37 +02002661 rate_control_rate_update(local, sband, rx->sta,
2662 IEEE80211_RC_SMPS_CHANGED);
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002663 goto handled;
2664 }
Johannes Bergec61cd62012-12-28 12:12:10 +01002665 case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
2666 struct ieee80211_supported_band *sband;
2667 u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth;
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002668 enum ieee80211_sta_rx_bandwidth max_bw, new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002669
2670 /* If it doesn't support 40 MHz it can't change ... */
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002671 if (!(rx->sta->sta.ht_cap.cap &
2672 IEEE80211_HT_CAP_SUP_WIDTH_20_40))
Johannes Bergec61cd62012-12-28 12:12:10 +01002673 goto handled;
2674
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002675 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ)
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002676 max_bw = IEEE80211_STA_RX_BW_20;
Johannes Bergec61cd62012-12-28 12:12:10 +01002677 else
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002678 max_bw = ieee80211_sta_cap_rx_bw(rx->sta);
2679
2680 /* set cur_max_bandwidth and recalc sta bw */
2681 rx->sta->cur_max_bandwidth = max_bw;
2682 new_bw = ieee80211_sta_cur_vht_bw(rx->sta);
Johannes Berge1a0c6b2013-02-07 11:47:44 +01002683
2684 if (rx->sta->sta.bandwidth == new_bw)
2685 goto handled;
Johannes Bergec61cd62012-12-28 12:12:10 +01002686
Eliad Peller1c45c5c2014-12-14 11:05:51 +02002687 rx->sta->sta.bandwidth = new_bw;
Johannes Bergec61cd62012-12-28 12:12:10 +01002688 sband = rx->local->hw.wiphy->bands[status->band];
2689
2690 rate_control_rate_update(local, sband, rx->sta,
2691 IEEE80211_RC_BW_CHANGED);
2692 goto handled;
2693 }
Johannes Berg1d8d3de2011-12-16 15:28:57 +01002694 default:
2695 goto invalid;
2696 }
2697
2698 break;
Johannes Berg1b3a2e42013-03-26 15:17:18 +01002699 case WLAN_CATEGORY_PUBLIC:
2700 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2701 goto invalid;
2702 if (sdata->vif.type != NL80211_IFTYPE_STATION)
2703 break;
2704 if (!rx->sta)
2705 break;
2706 if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid))
2707 break;
2708 if (mgmt->u.action.u.ext_chan_switch.action_code !=
2709 WLAN_PUB_ACTION_EXT_CHANSW_ANN)
2710 break;
2711 if (len < offsetof(struct ieee80211_mgmt,
2712 u.action.u.ext_chan_switch.variable))
2713 goto invalid;
2714 goto queue;
Johannes Berg0af83d32012-12-27 18:55:36 +01002715 case WLAN_CATEGORY_VHT:
2716 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
2717 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
2718 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
2719 sdata->vif.type != NL80211_IFTYPE_AP &&
2720 sdata->vif.type != NL80211_IFTYPE_ADHOC)
2721 break;
2722
2723 /* verify action code is present */
2724 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2725 goto invalid;
2726
2727 switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
2728 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
2729 u8 opmode;
2730
2731 /* verify opmode is present */
2732 if (len < IEEE80211_MIN_ACTION_SIZE + 2)
2733 goto invalid;
2734
2735 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
2736
2737 ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
Eyal Shapiracf1e05c2015-12-08 16:04:36 +02002738 opmode, status->band);
Johannes Berg0af83d32012-12-27 18:55:36 +01002739 goto handled;
2740 }
2741 default:
2742 break;
2743 }
2744 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002745 case WLAN_CATEGORY_BACK:
Johannes Berg8abd3f92009-02-10 21:25:47 +01002746 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Thomas Pedersenae2772b2011-10-26 14:47:29 -07002747 sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
Johannes Berg8abd3f92009-02-10 21:25:47 +01002748 sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
Alexander Simon13c40c52011-11-30 16:56:34 +01002749 sdata->vif.type != NL80211_IFTYPE_AP &&
2750 sdata->vif.type != NL80211_IFTYPE_ADHOC)
Johannes Berg84040802010-02-15 12:46:39 +02002751 break;
Johannes Berg8abd3f92009-02-10 21:25:47 +01002752
Jouni Malinen026331c2010-02-15 12:53:10 +02002753 /* verify action_code is present */
2754 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2755 break;
2756
Johannes Bergde1ede72008-09-09 14:42:50 +02002757 switch (mgmt->u.action.u.addba_req.action_code) {
2758 case WLAN_ACTION_ADDBA_REQ:
2759 if (len < (IEEE80211_MIN_ACTION_SIZE +
2760 sizeof(mgmt->u.action.u.addba_req)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002761 goto invalid;
2762 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002763 case WLAN_ACTION_ADDBA_RESP:
2764 if (len < (IEEE80211_MIN_ACTION_SIZE +
2765 sizeof(mgmt->u.action.u.addba_resp)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002766 goto invalid;
2767 break;
Johannes Bergde1ede72008-09-09 14:42:50 +02002768 case WLAN_ACTION_DELBA:
2769 if (len < (IEEE80211_MIN_ACTION_SIZE +
2770 sizeof(mgmt->u.action.u.delba)))
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002771 goto invalid;
2772 break;
2773 default:
2774 goto invalid;
Johannes Bergde1ede72008-09-09 14:42:50 +02002775 }
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002776
Johannes Berg8b58ff82010-06-10 10:21:51 +02002777 goto queue;
Johannes Berg39192c02008-09-09 14:49:03 +02002778 case WLAN_CATEGORY_SPECTRUM_MGMT:
Jouni Malinen026331c2010-02-15 12:53:10 +02002779 /* verify action_code is present */
2780 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
2781 break;
2782
Johannes Berg39192c02008-09-09 14:49:03 +02002783 switch (mgmt->u.action.u.measurement.action_code) {
2784 case WLAN_ACTION_SPCT_MSR_REQ:
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002785 if (status->band != IEEE80211_BAND_5GHZ)
2786 break;
2787
Johannes Berg39192c02008-09-09 14:49:03 +02002788 if (len < (IEEE80211_MIN_ACTION_SIZE +
2789 sizeof(mgmt->u.action.u.measurement)))
Johannes Berg84040802010-02-15 12:46:39 +02002790 break;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002791
Johannes Bergcc32abd2009-05-15 11:52:31 +02002792 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002793 break;
Johannes Bergcc32abd2009-05-15 11:52:31 +02002794
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002795 ieee80211_process_measurement_req(sdata, mgmt, len);
2796 goto handled;
2797 case WLAN_ACTION_SPCT_CHL_SWITCH: {
2798 u8 *bssid;
2799 if (len < (IEEE80211_MIN_ACTION_SIZE +
2800 sizeof(mgmt->u.action.u.chan_switch)))
2801 break;
2802
2803 if (sdata->vif.type != NL80211_IFTYPE_STATION &&
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002804 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2805 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002806 break;
2807
2808 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2809 bssid = sdata->u.mgd.bssid;
2810 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2811 bssid = sdata->u.ibss.bssid;
Chun-Yeow Yeohb8456a12013-10-17 15:55:02 -07002812 else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
2813 bssid = mgmt->sa;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002814 else
2815 break;
2816
2817 if (!ether_addr_equal(mgmt->bssid, bssid))
Johannes Berg84040802010-02-15 12:46:39 +02002818 break;
Sujithc481ec92009-01-06 09:28:37 +05302819
Johannes Berg8b58ff82010-06-10 10:21:51 +02002820 goto queue;
Simon Wunderlichcd7760e2013-08-28 13:41:31 +02002821 }
Johannes Berg39192c02008-09-09 14:49:03 +02002822 }
2823 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002824 case WLAN_CATEGORY_SA_QUERY:
2825 if (len < (IEEE80211_MIN_ACTION_SIZE +
2826 sizeof(mgmt->u.action.u.sa_query)))
Johannes Berg84040802010-02-15 12:46:39 +02002827 break;
2828
Jouni Malinenfea14732009-01-08 13:32:06 +02002829 switch (mgmt->u.action.u.sa_query.action) {
2830 case WLAN_ACTION_SA_QUERY_REQUEST:
2831 if (sdata->vif.type != NL80211_IFTYPE_STATION)
Johannes Berg84040802010-02-15 12:46:39 +02002832 break;
Jouni Malinenfea14732009-01-08 13:32:06 +02002833 ieee80211_process_sa_query_req(sdata, mgmt, len);
Johannes Berg84040802010-02-15 12:46:39 +02002834 goto handled;
Jouni Malinenfea14732009-01-08 13:32:06 +02002835 }
2836 break;
Thomas Pedersen8db09852011-08-12 20:01:00 -07002837 case WLAN_CATEGORY_SELF_PROTECTED:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002838 if (len < (IEEE80211_MIN_ACTION_SIZE +
2839 sizeof(mgmt->u.action.u.self_prot.action_code)))
2840 break;
2841
Thomas Pedersen8db09852011-08-12 20:01:00 -07002842 switch (mgmt->u.action.u.self_prot.action_code) {
2843 case WLAN_SP_MESH_PEERING_OPEN:
2844 case WLAN_SP_MESH_PEERING_CLOSE:
2845 case WLAN_SP_MESH_PEERING_CONFIRM:
2846 if (!ieee80211_vif_is_mesh(&sdata->vif))
2847 goto invalid;
Thomas Pedersena6dad6a2013-03-04 13:06:12 -08002848 if (sdata->u.mesh.user_mpm)
Thomas Pedersen8db09852011-08-12 20:01:00 -07002849 /* userspace handles this frame */
2850 break;
2851 goto queue;
2852 case WLAN_SP_MGK_INFORM:
2853 case WLAN_SP_MGK_ACK:
2854 if (!ieee80211_vif_is_mesh(&sdata->vif))
2855 goto invalid;
2856 break;
2857 }
2858 break;
Javier Cardonad3aaec8a2011-05-03 16:57:09 -07002859 case WLAN_CATEGORY_MESH_ACTION:
Johannes Berg9b395bc2012-10-26 00:36:40 +02002860 if (len < (IEEE80211_MIN_ACTION_SIZE +
2861 sizeof(mgmt->u.action.u.mesh_action.action_code)))
2862 break;
2863
Johannes Berg77a121c2010-06-10 10:21:34 +02002864 if (!ieee80211_vif_is_mesh(&sdata->vif))
2865 break;
Thomas Pedersen25d49e42011-08-11 19:35:15 -07002866 if (mesh_action_is_path_sel(mgmt) &&
Johannes Berg1df332e2012-10-26 00:09:11 +02002867 !mesh_path_sel_is_hwmp(sdata))
Javier Cardonac7108a72010-12-16 17:37:50 -08002868 break;
2869 goto queue;
Johannes Berg84040802010-02-15 12:46:39 +02002870 }
Jouni Malinen026331c2010-02-15 12:53:10 +02002871
Johannes Berg2e161f72010-08-12 15:38:38 +02002872 return RX_CONTINUE;
2873
Johannes Bergbed7ee6e2010-06-10 10:21:35 +02002874 invalid:
Johannes Berg554891e2010-09-24 12:38:25 +02002875 status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM;
Johannes Berg2e161f72010-08-12 15:38:38 +02002876 /* will return in the next handlers */
2877 return RX_CONTINUE;
2878
2879 handled:
2880 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002881 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02002882 dev_kfree_skb(rx->skb);
2883 return RX_QUEUED;
2884
2885 queue:
2886 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
2887 skb_queue_tail(&sdata->skb_queue, rx->skb);
2888 ieee80211_queue_work(&local->hw, &sdata->work);
2889 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002890 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02002891 return RX_QUEUED;
2892}
2893
2894static ieee80211_rx_result debug_noinline
2895ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx)
2896{
Johannes Berg554891e2010-09-24 12:38:25 +02002897 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg804483e2012-03-05 22:18:41 +01002898 int sig = 0;
Johannes Berg2e161f72010-08-12 15:38:38 +02002899
2900 /* skip known-bad action frames and return them in the next handler */
Johannes Berg554891e2010-09-24 12:38:25 +02002901 if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM)
Johannes Berg2e161f72010-08-12 15:38:38 +02002902 return RX_CONTINUE;
Felix Fietkaud7907442010-01-07 20:23:53 +01002903
Jouni Malinen026331c2010-02-15 12:53:10 +02002904 /*
2905 * Getting here means the kernel doesn't know how to handle
2906 * it, but maybe userspace does ... include returned frames
2907 * so userspace can register for those to know whether ones
2908 * it transmitted were processed or returned.
2909 */
Jouni Malinen026331c2010-02-15 12:53:10 +02002910
Johannes Berg30686bf2015-06-02 21:39:54 +02002911 if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM))
Johannes Berg804483e2012-03-05 22:18:41 +01002912 sig = status->signal;
2913
Johannes Berg71bbc992012-06-15 15:30:18 +02002914 if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig,
Vladimir Kondratiev970fdfa2014-08-11 03:29:57 -07002915 rx->skb->data, rx->skb->len, 0)) {
Johannes Berg2e161f72010-08-12 15:38:38 +02002916 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02002917 rx->sta->rx_stats.packets++;
Johannes Berg2e161f72010-08-12 15:38:38 +02002918 dev_kfree_skb(rx->skb);
2919 return RX_QUEUED;
2920 }
2921
Johannes Berg2e161f72010-08-12 15:38:38 +02002922 return RX_CONTINUE;
2923}
2924
2925static ieee80211_rx_result debug_noinline
2926ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx)
2927{
2928 struct ieee80211_local *local = rx->local;
2929 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data;
2930 struct sk_buff *nskb;
2931 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg554891e2010-09-24 12:38:25 +02002932 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
Johannes Berg2e161f72010-08-12 15:38:38 +02002933
2934 if (!ieee80211_is_action(mgmt->frame_control))
2935 return RX_CONTINUE;
2936
2937 /*
2938 * For AP mode, hostapd is responsible for handling any action
2939 * frames that we didn't handle, including returning unknown
2940 * ones. For all other modes we will return them to the sender,
2941 * setting the 0x80 bit in the action category, as required by
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002942 * 802.11-2012 9.24.4.
Johannes Berg2e161f72010-08-12 15:38:38 +02002943 * Newer versions of hostapd shall also use the management frame
2944 * registration mechanisms, but older ones still use cooked
2945 * monitor interfaces so push all frames there.
2946 */
Johannes Berg554891e2010-09-24 12:38:25 +02002947 if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) &&
Johannes Berg2e161f72010-08-12 15:38:38 +02002948 (sdata->vif.type == NL80211_IFTYPE_AP ||
2949 sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
2950 return RX_DROP_MONITOR;
Jouni Malinen026331c2010-02-15 12:53:10 +02002951
Johannes Berg4b5ebcc2012-06-27 15:38:56 +02002952 if (is_multicast_ether_addr(mgmt->da))
2953 return RX_DROP_MONITOR;
2954
Johannes Berg84040802010-02-15 12:46:39 +02002955 /* do not return rejected action frames */
2956 if (mgmt->u.action.category & 0x80)
2957 return RX_DROP_UNUSABLE;
2958
2959 nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0,
2960 GFP_ATOMIC);
2961 if (nskb) {
John W. Linville292b4df2010-06-24 11:13:56 -04002962 struct ieee80211_mgmt *nmgmt = (void *)nskb->data;
Johannes Berg84040802010-02-15 12:46:39 +02002963
John W. Linville292b4df2010-06-24 11:13:56 -04002964 nmgmt->u.action.category |= 0x80;
2965 memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN);
2966 memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN);
Johannes Berg84040802010-02-15 12:46:39 +02002967
2968 memset(nskb->cb, 0, sizeof(nskb->cb));
2969
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002970 if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
2971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb);
2972
2973 info->flags = IEEE80211_TX_CTL_TX_OFFCHAN |
2974 IEEE80211_TX_INTFL_OFFCHAN_TX_OK |
2975 IEEE80211_TX_CTL_NO_CCK_RATE;
Johannes Berg30686bf2015-06-02 21:39:54 +02002976 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
Johannes Berg07e5a5f2013-03-07 13:22:05 +01002977 info->hw_queue =
2978 local->hw.offchannel_tx_hw_queue;
2979 }
2980
2981 __ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7,
2982 status->band);
Johannes Bergde1ede72008-09-09 14:42:50 +02002983 }
Johannes Berg39192c02008-09-09 14:49:03 +02002984 dev_kfree_skb(rx->skb);
2985 return RX_QUEUED;
Johannes Bergde1ede72008-09-09 14:42:50 +02002986}
2987
2988static ieee80211_rx_result debug_noinline
Johannes Berg5cf121c2008-02-25 16:27:43 +01002989ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx)
Johannes Berg571ecf62007-07-27 15:43:22 +02002990{
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01002991 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg77a121c2010-06-10 10:21:34 +02002992 struct ieee80211_mgmt *mgmt = (void *)rx->skb->data;
2993 __le16 stype;
Johannes Berg571ecf62007-07-27 15:43:22 +02002994
Johannes Berg77a121c2010-06-10 10:21:34 +02002995 stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE);
Johannes Berg472dbc42008-09-11 00:01:49 +02002996
Johannes Berg77a121c2010-06-10 10:21:34 +02002997 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
2998 sdata->vif.type != NL80211_IFTYPE_ADHOC &&
Rostislav Lisovy239281f2014-11-03 10:33:19 +01002999 sdata->vif.type != NL80211_IFTYPE_OCB &&
Johannes Berg77a121c2010-06-10 10:21:34 +02003000 sdata->vif.type != NL80211_IFTYPE_STATION)
3001 return RX_DROP_MONITOR;
Johannes Bergf9d540e2007-09-28 14:02:09 +02003002
Johannes Berg77a121c2010-06-10 10:21:34 +02003003 switch (stype) {
Johannes Berg66e67e42012-01-20 13:55:27 +01003004 case cpu_to_le16(IEEE80211_STYPE_AUTH):
Johannes Berg77a121c2010-06-10 10:21:34 +02003005 case cpu_to_le16(IEEE80211_STYPE_BEACON):
3006 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
3007 /* process for all: mesh, mlme, ibss */
3008 break;
Johannes Berg66e67e42012-01-20 13:55:27 +01003009 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
3010 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
Johannes Berg77a121c2010-06-10 10:21:34 +02003011 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
3012 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
Christian Lamparter2c313332010-11-29 20:53:23 +01003013 if (is_multicast_ether_addr(mgmt->da) &&
3014 !is_broadcast_ether_addr(mgmt->da))
3015 return RX_DROP_MONITOR;
3016
Johannes Berg77a121c2010-06-10 10:21:34 +02003017 /* process only for station */
3018 if (sdata->vif.type != NL80211_IFTYPE_STATION)
3019 return RX_DROP_MONITOR;
3020 break;
3021 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
Thomas Pedersen9fb04b52013-02-14 11:20:14 -08003022 /* process only for ibss and mesh */
3023 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
3024 sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
Johannes Berg77a121c2010-06-10 10:21:34 +02003025 return RX_DROP_MONITOR;
3026 break;
3027 default:
3028 return RX_DROP_MONITOR;
3029 }
Johannes Berg46900292009-02-15 12:44:28 +01003030
Johannes Berg77a121c2010-06-10 10:21:34 +02003031 /* queue up frame and kick off work to process it */
Johannes Bergc1475ca2010-06-10 10:21:37 +02003032 rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
Johannes Berg77a121c2010-06-10 10:21:34 +02003033 skb_queue_tail(&sdata->skb_queue, rx->skb);
3034 ieee80211_queue_work(&rx->local->hw, &sdata->work);
Johannes Berg8b58ff82010-06-10 10:21:51 +02003035 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003036 rx->sta->rx_stats.packets++;
Johannes Berg77a121c2010-06-10 10:21:34 +02003037
3038 return RX_QUEUED;
Johannes Berg571ecf62007-07-27 15:43:22 +02003039}
3040
Johannes Berg5f0b7de2009-11-16 13:58:21 +01003041static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx,
3042 struct ieee80211_rate *rate)
Michael Wu3d30d942008-01-31 19:48:27 +01003043{
3044 struct ieee80211_sub_if_data *sdata;
3045 struct ieee80211_local *local = rx->local;
Michael Wu3d30d942008-01-31 19:48:27 +01003046 struct sk_buff *skb = rx->skb, *skb2;
3047 struct net_device *prev_dev = NULL;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003048 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003049 int needed_headroom;
Michael Wu3d30d942008-01-31 19:48:27 +01003050
Johannes Berg554891e2010-09-24 12:38:25 +02003051 /*
3052 * If cooked monitor has been processed already, then
3053 * don't do it again. If not, set the flag.
3054 */
3055 if (rx->flags & IEEE80211_RX_CMNTR)
John W. Linville7c1e1832010-09-24 15:52:49 -04003056 goto out_free_skb;
Johannes Berg554891e2010-09-24 12:38:25 +02003057 rx->flags |= IEEE80211_RX_CMNTR;
John W. Linville7c1e1832010-09-24 15:52:49 -04003058
Johannes Berg152c4772011-10-21 10:22:22 +02003059 /* If there are no cooked monitor interfaces, just free the SKB */
3060 if (!local->cooked_mntrs)
3061 goto out_free_skb;
3062
Johannes Berg1f7bba72014-11-06 22:56:36 +01003063 /* vendor data is long removed here */
3064 status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA;
Johannes Berg293702a2012-03-02 13:18:19 +01003065 /* room for the radiotap header based on driver features */
Johannes Berg1f7bba72014-11-06 22:56:36 +01003066 needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb);
Johannes Berg293702a2012-03-02 13:18:19 +01003067
3068 if (skb_headroom(skb) < needed_headroom &&
3069 pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC))
Michael Wu3d30d942008-01-31 19:48:27 +01003070 goto out_free_skb;
3071
Johannes Berg293702a2012-03-02 13:18:19 +01003072 /* prepend radiotap information */
Felix Fietkau973ef212012-04-16 14:56:48 +02003073 ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom,
3074 false);
Michael Wu3d30d942008-01-31 19:48:27 +01003075
3076 skb_set_mac_header(skb, 0);
3077 skb->ip_summed = CHECKSUM_UNNECESSARY;
3078 skb->pkt_type = PACKET_OTHERHOST;
3079 skb->protocol = htons(ETH_P_802_2);
3080
3081 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
Johannes Berg9607e6b2009-12-23 13:15:31 +01003082 if (!ieee80211_sdata_running(sdata))
Michael Wu3d30d942008-01-31 19:48:27 +01003083 continue;
3084
Johannes Berg05c914f2008-09-11 00:01:58 +02003085 if (sdata->vif.type != NL80211_IFTYPE_MONITOR ||
Michael Wu3d30d942008-01-31 19:48:27 +01003086 !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES))
3087 continue;
3088
3089 if (prev_dev) {
3090 skb2 = skb_clone(skb, GFP_ATOMIC);
3091 if (skb2) {
3092 skb2->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003093 netif_receive_skb(skb2);
Michael Wu3d30d942008-01-31 19:48:27 +01003094 }
3095 }
3096
3097 prev_dev = sdata->dev;
Johannes Berg5a490512015-04-22 17:10:38 +02003098 ieee80211_rx_stats(sdata->dev, skb->len);
Michael Wu3d30d942008-01-31 19:48:27 +01003099 }
3100
3101 if (prev_dev) {
3102 skb->dev = prev_dev;
John W. Linville5548a8a2010-06-24 14:25:56 -04003103 netif_receive_skb(skb);
Johannes Berg554891e2010-09-24 12:38:25 +02003104 return;
3105 }
Michael Wu3d30d942008-01-31 19:48:27 +01003106
3107 out_free_skb:
3108 dev_kfree_skb(skb);
3109}
3110
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003111static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx,
3112 ieee80211_rx_result res)
3113{
3114 switch (res) {
3115 case RX_DROP_MONITOR:
3116 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3117 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003118 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003119 /* fall through */
3120 case RX_CONTINUE: {
3121 struct ieee80211_rate *rate = NULL;
3122 struct ieee80211_supported_band *sband;
3123 struct ieee80211_rx_status *status;
3124
3125 status = IEEE80211_SKB_RXCB((rx->skb));
3126
3127 sband = rx->local->hw.wiphy->bands[status->band];
Johannes Berg56146182012-11-09 15:07:02 +01003128 if (!(status->flag & RX_FLAG_HT) &&
3129 !(status->flag & RX_FLAG_VHT))
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003130 rate = &sband->bitrates[status->rate_idx];
3131
3132 ieee80211_rx_cooked_monitor(rx, rate);
3133 break;
3134 }
3135 case RX_DROP_UNUSABLE:
3136 I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop);
3137 if (rx->sta)
Johannes Berge5a9f8d2015-10-16 17:54:47 +02003138 rx->sta->rx_stats.dropped++;
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003139 dev_kfree_skb(rx->skb);
3140 break;
3141 case RX_QUEUED:
3142 I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued);
3143 break;
3144 }
3145}
3146
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003147static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx,
3148 struct sk_buff_head *frames)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003149{
3150 ieee80211_rx_result res = RX_DROP_MONITOR;
3151 struct sk_buff *skb;
3152
3153#define CALL_RXH(rxh) \
3154 do { \
3155 res = rxh(rx); \
3156 if (res != RX_CONTINUE) \
3157 goto rxh_next; \
3158 } while (0);
3159
Johannes Berg45ceeee2015-03-16 09:08:20 +01003160 /* Lock here to avoid hitting all of the data used in the RX
3161 * path (e.g. key data, station data, ...) concurrently when
3162 * a frame is released from the reorder buffer due to timeout
3163 * from the timer, potentially concurrently with RX from the
3164 * driver.
3165 */
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003166 spin_lock_bh(&rx->local->rx_path_lock);
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003167
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003168 while ((skb = __skb_dequeue(frames))) {
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003169 /*
3170 * all the other fields are valid across frames
3171 * that belong to an aMPDU since they are on the
3172 * same TID from the same station
3173 */
3174 rx->skb = skb;
3175
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003176 CALL_RXH(ieee80211_rx_h_check_more_data)
Johannes Berg47086fc2011-09-29 16:04:33 +02003177 CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003178 CALL_RXH(ieee80211_rx_h_sta_process)
Johan Almbladh86c228a2013-08-14 15:29:46 +02003179 CALL_RXH(ieee80211_rx_h_decrypt)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003180 CALL_RXH(ieee80211_rx_h_defragment)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003181 CALL_RXH(ieee80211_rx_h_michael_mic_verify)
3182 /* must be after MMIC verify so header is counted in MPDU mic */
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003183#ifdef CONFIG_MAC80211_MESH
3184 if (ieee80211_vif_is_mesh(&rx->sdata->vif))
3185 CALL_RXH(ieee80211_rx_h_mesh_fwding);
3186#endif
Javier Cardona2154c812011-09-07 17:49:53 -07003187 CALL_RXH(ieee80211_rx_h_amsdu)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003188 CALL_RXH(ieee80211_rx_h_data)
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003189
3190 /* special treatment -- needs the queue */
3191 res = ieee80211_rx_h_ctrl(rx, frames);
3192 if (res != RX_CONTINUE)
3193 goto rxh_next;
3194
Johannes Berg2e161f72010-08-12 15:38:38 +02003195 CALL_RXH(ieee80211_rx_h_mgmt_check)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003196 CALL_RXH(ieee80211_rx_h_action)
Johannes Berg2e161f72010-08-12 15:38:38 +02003197 CALL_RXH(ieee80211_rx_h_userspace_mgmt)
3198 CALL_RXH(ieee80211_rx_h_action_return)
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003199 CALL_RXH(ieee80211_rx_h_mgmt)
3200
3201 rxh_next:
3202 ieee80211_rx_handlers_result(rx, res);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003203
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003204#undef CALL_RXH
3205 }
Christian Lamparter24a8fda2010-12-30 17:25:29 +01003206
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003207 spin_unlock_bh(&rx->local->rx_path_lock);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003208}
Johannes Berg571ecf62007-07-27 15:43:22 +02003209
Johannes Berg4406c372010-09-24 11:21:06 +02003210static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx)
Johannes Berg58905292008-01-31 19:48:25 +01003211{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003212 struct sk_buff_head reorder_release;
Johannes Berg58905292008-01-31 19:48:25 +01003213 ieee80211_rx_result res = RX_DROP_MONITOR;
3214
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003215 __skb_queue_head_init(&reorder_release);
3216
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003217#define CALL_RXH(rxh) \
3218 do { \
3219 res = rxh(rx); \
3220 if (res != RX_CONTINUE) \
Johannes Berg2569a822009-11-25 17:46:17 +01003221 goto rxh_next; \
Luis Carlos Coboe32f85f2008-08-05 19:34:52 +02003222 } while (0);
Johannes Berg58905292008-01-31 19:48:25 +01003223
Johannes Berg03954422014-11-11 16:49:25 +01003224 CALL_RXH(ieee80211_rx_h_check_dup)
Johannes Berg49461622008-06-30 15:10:45 +02003225 CALL_RXH(ieee80211_rx_h_check)
Johannes Berg2569a822009-11-25 17:46:17 +01003226
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003227 ieee80211_rx_reorder_ampdu(rx, &reorder_release);
Johannes Berg2569a822009-11-25 17:46:17 +01003228
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003229 ieee80211_rx_handlers(rx, &reorder_release);
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003230 return;
Johannes Berg49461622008-06-30 15:10:45 +02003231
Johannes Berg2569a822009-11-25 17:46:17 +01003232 rxh_next:
Christian Lamparteraa0c8632010-08-05 01:36:04 +02003233 ieee80211_rx_handlers_result(rx, res);
3234
3235#undef CALL_RXH
Johannes Berg58905292008-01-31 19:48:25 +01003236}
3237
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003238/*
Johannes Bergdd318572010-11-29 11:09:16 +01003239 * This function makes calls into the RX path, therefore
3240 * it has to be invoked under RCU read lock.
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003241 */
3242void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
3243{
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003244 struct sk_buff_head frames;
Johannes Berg554891e2010-09-24 12:38:25 +02003245 struct ieee80211_rx_data rx = {
3246 .sta = sta,
3247 .sdata = sta->sdata,
3248 .local = sta->local,
Johannes Berg9e262972011-07-07 18:45:03 +02003249 /* This is OK -- must be QoS data frame */
3250 .security_idx = tid,
3251 .seqno_idx = tid,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003252 .napi = NULL, /* must be NULL to not have races */
Johannes Berg554891e2010-09-24 12:38:25 +02003253 };
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003254 struct tid_ampdu_rx *tid_agg_rx;
3255
3256 tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
3257 if (!tid_agg_rx)
3258 return;
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003259
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003260 __skb_queue_head_init(&frames);
3261
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003262 spin_lock(&tid_agg_rx->reorder_lock);
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003263 ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames);
Christian Lamparter2c15a0c2010-08-24 19:22:42 +02003264 spin_unlock(&tid_agg_rx->reorder_lock);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003265
Emmanuel Grumbachb497de62015-04-20 22:53:38 +03003266 if (!skb_queue_empty(&frames)) {
3267 struct ieee80211_event event = {
3268 .type = BA_FRAME_TIMEOUT,
3269 .u.ba.tid = tid,
3270 .u.ba.sta = &sta->sta,
3271 };
3272 drv_event_callback(rx.local, rx.sdata, &event);
3273 }
3274
Christian Lamparterf9e124f2013-02-04 17:44:44 +00003275 ieee80211_rx_handlers(&rx, &frames);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +02003276}
3277
Johannes Berg571ecf62007-07-27 15:43:22 +02003278/* main receive path */
3279
Johannes Berga58fbe12015-04-22 15:08:39 +02003280static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
Johannes Berg23a24de2007-07-27 15:43:22 +02003281{
Johannes Berg20b01f82010-09-24 11:21:05 +02003282 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003283 struct sk_buff *skb = rx->skb;
Johannes Berga58fbe12015-04-22 15:08:39 +02003284 struct ieee80211_hdr *hdr = (void *)skb->data;
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003285 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
3286 u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type);
Johannes Berg23a24de2007-07-27 15:43:22 +02003287 int multicast = is_multicast_ether_addr(hdr->addr1);
3288
Johannes Berg51fb61e2007-12-19 01:31:27 +01003289 switch (sdata->vif.type) {
Johannes Berg05c914f2008-09-11 00:01:58 +02003290 case NL80211_IFTYPE_STATION:
Johannes Berg9bc383d2009-11-19 11:55:19 +01003291 if (!bssid && !sdata->u.mgd.use_4addr)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003292 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003293 if (multicast)
3294 return true;
3295 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003296 case NL80211_IFTYPE_ADHOC:
Johannes Berg23a24de2007-07-27 15:43:22 +02003297 if (!bssid)
Johannes Berg3c2723f52014-01-07 16:23:24 +01003298 return false;
Felix Fietkau6329b8d2013-09-17 11:15:43 +02003299 if (ether_addr_equal(sdata->vif.addr, hdr->addr2) ||
3300 ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003301 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003302 if (ieee80211_is_beacon(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003303 return true;
Johannes Berga58fbe12015-04-22 15:08:39 +02003304 if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003305 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003306 if (!multicast &&
3307 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003308 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003309 if (!rx->sta) {
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003310 int rate_idx;
Johannes Berg56146182012-11-09 15:07:02 +01003311 if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT))
3312 rate_idx = 0; /* TODO: HT/VHT rates */
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003313 else
Johannes Bergeb9fb5b2009-11-16 13:58:20 +01003314 rate_idx = status->rate_idx;
Johannes Berg8bf11d82011-12-15 11:17:37 +01003315 ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2,
3316 BIT(rate_idx));
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003317 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003318 return true;
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003319 case NL80211_IFTYPE_OCB:
3320 if (!bssid)
3321 return false;
Bertold Van den Berghcc117292015-08-05 16:02:42 +02003322 if (!ieee80211_is_data_present(hdr->frame_control))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003323 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003324 if (!is_broadcast_ether_addr(bssid))
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003325 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003326 if (!multicast &&
3327 !ether_addr_equal(sdata->dev->dev_addr, hdr->addr1))
Johannes Bergdf140462015-04-22 14:40:58 +02003328 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003329 if (!rx->sta) {
Rostislav Lisovy239281f2014-11-03 10:33:19 +01003330 int rate_idx;
3331 if (status->flag & RX_FLAG_HT)
3332 rate_idx = 0; /* TODO: HT rates */
3333 else
3334 rate_idx = status->rate_idx;
3335 ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2,
3336 BIT(rate_idx));
3337 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003338 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003339 case NL80211_IFTYPE_MESH_POINT:
Johannes Berga58fbe12015-04-22 15:08:39 +02003340 if (multicast)
3341 return true;
3342 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
Johannes Berg05c914f2008-09-11 00:01:58 +02003343 case NL80211_IFTYPE_AP_VLAN:
3344 case NL80211_IFTYPE_AP:
Johannes Berga58fbe12015-04-22 15:08:39 +02003345 if (!bssid)
3346 return ether_addr_equal(sdata->vif.addr, hdr->addr1);
3347
3348 if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) {
Johannes Berg3df6eae2011-12-06 10:39:40 +01003349 /*
3350 * Accept public action frames even when the
3351 * BSSID doesn't match, this is used for P2P
3352 * and location updates. Note that mac80211
3353 * itself never looks at these frames.
3354 */
Johannes Berg2b9ccd42013-05-13 16:42:40 +02003355 if (!multicast &&
3356 !ether_addr_equal(sdata->vif.addr, hdr->addr1))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003357 return false;
Johannes Bergd48b2962012-07-06 22:19:27 +02003358 if (ieee80211_is_public_action(hdr, skb->len))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003359 return true;
Johannes Berg5c900672015-04-22 14:48:34 +02003360 return ieee80211_is_beacon(hdr->frame_control);
Johannes Berga58fbe12015-04-22 15:08:39 +02003361 }
3362
3363 if (!ieee80211_has_tods(hdr->frame_control)) {
Arik Nemtsovdb8e1732014-07-17 17:14:30 +03003364 /* ignore data frames to TDLS-peers */
3365 if (ieee80211_is_data(hdr->frame_control))
3366 return false;
3367 /* ignore action frames to TDLS-peers */
3368 if (ieee80211_is_action(hdr->frame_control) &&
3369 !ether_addr_equal(bssid, hdr->addr1))
3370 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003371 }
Johannes Berga58fbe12015-04-22 15:08:39 +02003372 return true;
Johannes Berg05c914f2008-09-11 00:01:58 +02003373 case NL80211_IFTYPE_WDS:
Harvey Harrisona7767f92008-07-02 16:30:51 -07003374 if (bssid || !ieee80211_is_data(hdr->frame_control))
Johannes Berg3c2723f52014-01-07 16:23:24 +01003375 return false;
Johannes Berga58fbe12015-04-22 15:08:39 +02003376 return ether_addr_equal(sdata->u.wds.remote_addr, hdr->addr2);
Johannes Bergf142c6b2012-06-18 20:07:15 +02003377 case NL80211_IFTYPE_P2P_DEVICE:
Johannes Berga58fbe12015-04-22 15:08:39 +02003378 return ieee80211_is_public_action(hdr, skb->len) ||
3379 ieee80211_is_probe_req(hdr->frame_control) ||
3380 ieee80211_is_probe_resp(hdr->frame_control) ||
3381 ieee80211_is_beacon(hdr->frame_control);
Johannes Berg2ca27bc2010-09-16 14:58:23 +02003382 default:
Johannes Bergfb1c1cd2007-09-26 15:19:43 +02003383 break;
Johannes Berg23a24de2007-07-27 15:43:22 +02003384 }
3385
Johannes Berga58fbe12015-04-22 15:08:39 +02003386 WARN_ON_ONCE(1);
3387 return false;
Johannes Berg23a24de2007-07-27 15:43:22 +02003388}
3389
Johannes Berg571ecf62007-07-27 15:43:22 +02003390/*
Johannes Berg4406c372010-09-24 11:21:06 +02003391 * This function returns whether or not the SKB
3392 * was destined for RX processing or not, which,
3393 * if consume is true, is equivalent to whether
3394 * or not the skb was consumed.
3395 */
3396static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx,
3397 struct sk_buff *skb, bool consume)
3398{
3399 struct ieee80211_local *local = rx->local;
3400 struct ieee80211_sub_if_data *sdata = rx->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003401
3402 rx->skb = skb;
Johannes Berg4406c372010-09-24 11:21:06 +02003403
Johannes Berga58fbe12015-04-22 15:08:39 +02003404 if (!ieee80211_accept_frame(rx))
Johannes Berg4406c372010-09-24 11:21:06 +02003405 return false;
3406
Johannes Berg4406c372010-09-24 11:21:06 +02003407 if (!consume) {
3408 skb = skb_copy(skb, GFP_ATOMIC);
3409 if (!skb) {
3410 if (net_ratelimit())
3411 wiphy_debug(local->hw.wiphy,
Ben Greearb305dae2011-01-08 10:30:54 -08003412 "failed to copy skb for %s\n",
Johannes Berg4406c372010-09-24 11:21:06 +02003413 sdata->name);
3414 return true;
3415 }
3416
3417 rx->skb = skb;
3418 }
3419
3420 ieee80211_invoke_rx_handlers(rx);
3421 return true;
3422}
3423
3424/*
Zhao, Gang6b59db72014-04-21 12:52:59 +08003425 * This is the actual Rx frames handler. as it belongs to Rx path it must
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003426 * be called with rcu_read_lock protection.
Johannes Berg571ecf62007-07-27 15:43:22 +02003427 */
Ron Rindjunsky71ebb4a2008-01-21 12:39:12 +02003428static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003429 struct sk_buff *skb,
3430 struct napi_struct *napi)
Johannes Berg571ecf62007-07-27 15:43:22 +02003431{
3432 struct ieee80211_local *local = hw_to_local(hw);
3433 struct ieee80211_sub_if_data *sdata;
Johannes Berg571ecf62007-07-27 15:43:22 +02003434 struct ieee80211_hdr *hdr;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003435 __le16 fc;
Johannes Berg5cf121c2008-02-25 16:27:43 +01003436 struct ieee80211_rx_data rx;
Johannes Berg4406c372010-09-24 11:21:06 +02003437 struct ieee80211_sub_if_data *prev;
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003438 struct sta_info *sta, *prev_sta;
3439 struct rhash_head *tmp;
Zhu Yie3cf8b32010-03-29 17:35:07 +08003440 int err = 0;
Johannes Berg571ecf62007-07-27 15:43:22 +02003441
Zhu Yie3cf8b32010-03-29 17:35:07 +08003442 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
Johannes Berg571ecf62007-07-27 15:43:22 +02003443 memset(&rx, 0, sizeof(rx));
3444 rx.skb = skb;
3445 rx.local = local;
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003446 rx.napi = napi;
Johannes Berg72abd812007-09-17 01:29:22 -04003447
Zhu Yie3cf8b32010-03-29 17:35:07 +08003448 if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc))
Johannes Bergc206ca62015-04-22 20:47:28 +02003449 I802_DEBUG_INC(local->dot11ReceivedFragmentCount);
Johannes Berg571ecf62007-07-27 15:43:22 +02003450
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003451 if (ieee80211_is_mgmt(fc)) {
3452 /* drop frame if too short for header */
3453 if (skb->len < ieee80211_hdrlen(fc))
3454 err = -ENOBUFS;
3455 else
3456 err = skb_linearize(skb);
3457 } else {
Zhu Yie3cf8b32010-03-29 17:35:07 +08003458 err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
Johannes Berg4a4f1a52012-10-26 00:33:36 +02003459 }
Zhu Yie3cf8b32010-03-29 17:35:07 +08003460
3461 if (err) {
3462 dev_kfree_skb(skb);
3463 return;
3464 }
3465
3466 hdr = (struct ieee80211_hdr *)skb->data;
Johannes Berg38f37142008-01-29 17:07:43 +01003467 ieee80211_parse_qos(&rx);
Johannes Bergd1c3a372009-01-07 00:26:10 +01003468 ieee80211_verify_alignment(&rx);
Johannes Berg38f37142008-01-29 17:07:43 +01003469
Johannes Bergd48b2962012-07-06 22:19:27 +02003470 if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) ||
3471 ieee80211_is_beacon(hdr->frame_control)))
3472 ieee80211_scan_rx(local, skb);
3473
Zhu Yie3cf8b32010-03-29 17:35:07 +08003474 if (ieee80211_is_data(fc)) {
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003475 const struct bucket_table *tbl;
3476
Ben Greear56af3262010-09-23 10:22:24 -07003477 prev_sta = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003478
Johannes Berg7bedd0c2015-02-13 21:55:15 +01003479 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
3480
3481 for_each_sta_info(local, tbl, hdr->addr2, sta, tmp) {
Ben Greear56af3262010-09-23 10:22:24 -07003482 if (!prev_sta) {
3483 prev_sta = sta;
3484 continue;
3485 }
3486
3487 rx.sta = prev_sta;
3488 rx.sdata = prev_sta->sdata;
Johannes Berg4406c372010-09-24 11:21:06 +02003489 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Johannes Berg571ecf62007-07-27 15:43:22 +02003490
Ben Greear56af3262010-09-23 10:22:24 -07003491 prev_sta = sta;
Johannes Berg4406c372010-09-24 11:21:06 +02003492 }
Ben Greear56af3262010-09-23 10:22:24 -07003493
3494 if (prev_sta) {
3495 rx.sta = prev_sta;
3496 rx.sdata = prev_sta->sdata;
3497
Johannes Berg4406c372010-09-24 11:21:06 +02003498 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
Ben Greear56af3262010-09-23 10:22:24 -07003499 return;
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303500 goto out;
Ben Greear56af3262010-09-23 10:22:24 -07003501 }
Johannes Berg4406c372010-09-24 11:21:06 +02003502 }
3503
Johannes Berg4b0dd982010-09-24 11:21:07 +02003504 prev = NULL;
Johannes Berg4406c372010-09-24 11:21:06 +02003505
Johannes Berg4b0dd982010-09-24 11:21:07 +02003506 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
3507 if (!ieee80211_sdata_running(sdata))
3508 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003509
Johannes Berg4b0dd982010-09-24 11:21:07 +02003510 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
3511 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3512 continue;
Johannes Bergabe60632009-11-25 17:46:18 +01003513
Johannes Berg4b0dd982010-09-24 11:21:07 +02003514 /*
3515 * frame is destined for this interface, but if it's
3516 * not also for the previous one we handle that after
3517 * the loop to avoid copying the SKB once too much
3518 */
Johannes Bergb2e77712007-09-26 15:19:39 +02003519
Johannes Berg4b0dd982010-09-24 11:21:07 +02003520 if (!prev) {
Johannes Berg340e11f2007-07-27 15:43:22 +02003521 prev = sdata;
Johannes Berg4b0dd982010-09-24 11:21:07 +02003522 continue;
Johannes Berg8e6f00322007-07-27 15:43:22 +02003523 }
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003524
Johannes Berg7852e362012-01-20 13:55:24 +01003525 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003526 rx.sdata = prev;
3527 ieee80211_prepare_and_rx_handle(&rx, skb, false);
Felix Fietkau4bb29f82010-01-22 00:36:39 +01003528
Johannes Berg4b0dd982010-09-24 11:21:07 +02003529 prev = sdata;
3530 }
Johannes Berg4406c372010-09-24 11:21:06 +02003531
Johannes Berg4b0dd982010-09-24 11:21:07 +02003532 if (prev) {
Johannes Berg7852e362012-01-20 13:55:24 +01003533 rx.sta = sta_info_get_bss(prev, hdr->addr2);
Johannes Berg4b0dd982010-09-24 11:21:07 +02003534 rx.sdata = prev;
3535
3536 if (ieee80211_prepare_and_rx_handle(&rx, skb, true))
3537 return;
Johannes Berg571ecf62007-07-27 15:43:22 +02003538 }
Johannes Berg4406c372010-09-24 11:21:06 +02003539
Senthil Balasubramanian8e26d5a2010-11-30 20:15:38 +05303540 out:
Johannes Berg4406c372010-09-24 11:21:06 +02003541 dev_kfree_skb(skb);
Johannes Berg571ecf62007-07-27 15:43:22 +02003542}
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003543
3544/*
3545 * This is the receive path handler. It is called by a low level driver when an
3546 * 802.11 MPDU is received from the hardware.
3547 */
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003548void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
3549 struct napi_struct *napi)
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003550{
3551 struct ieee80211_local *local = hw_to_local(hw);
Johannes Berg8318d782008-01-24 19:38:38 +01003552 struct ieee80211_rate *rate = NULL;
3553 struct ieee80211_supported_band *sband;
Johannes Bergf1d58c22009-06-17 13:13:00 +02003554 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
Johannes Berg8318d782008-01-24 19:38:38 +01003555
Johannes Bergd20ef632009-10-11 15:10:40 +02003556 WARN_ON_ONCE(softirq_count() == 0);
3557
Johannes Berg444e38032012-09-30 17:08:35 +02003558 if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
Johannes Berg77a980d2009-08-24 11:46:30 +02003559 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003560
3561 sband = local->hw.wiphy->bands[status->band];
Johannes Berg77a980d2009-08-24 11:46:30 +02003562 if (WARN_ON(!sband))
3563 goto drop;
Johannes Berg8318d782008-01-24 19:38:38 +01003564
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003565 /*
3566 * If we're suspending, it is possible although not too likely
3567 * that we'd be receiving frames after having already partially
3568 * quiesced the stack. We can't process such frames then since
3569 * that might, for example, cause stations to be added or other
3570 * driver callbacks be invoked.
3571 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003572 if (unlikely(local->quiescing || local->suspended))
3573 goto drop;
Johannes Berg89c3a8a2009-07-28 18:10:17 +02003574
Arik Nemtsov04800ad2012-06-06 11:25:02 +03003575 /* We might be during a HW reconfig, prevent Rx for the same reason */
3576 if (unlikely(local->in_reconfig))
3577 goto drop;
3578
Johannes Bergea77f122009-08-21 14:44:45 +02003579 /*
3580 * The same happens when we're not even started,
3581 * but that's worth a warning.
3582 */
Johannes Berg77a980d2009-08-24 11:46:30 +02003583 if (WARN_ON(!local->started))
3584 goto drop;
Johannes Bergea77f122009-08-21 14:44:45 +02003585
Johannes Bergfc885182010-07-30 13:23:12 +02003586 if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) {
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003587 /*
Johannes Bergfc885182010-07-30 13:23:12 +02003588 * Validate the rate, unless a PLCP error means that
3589 * we probably can't have a valid rate here anyway.
Luis R. Rodrigueze5d6eb82009-11-09 16:03:22 -05003590 */
Johannes Bergfc885182010-07-30 13:23:12 +02003591
3592 if (status->flag & RX_FLAG_HT) {
3593 /*
3594 * rate_idx is MCS index, which can be [0-76]
3595 * as documented on:
3596 *
3597 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
3598 *
3599 * Anything else would be some sort of driver or
3600 * hardware error. The driver should catch hardware
3601 * errors.
3602 */
Johannes Berg444e38032012-09-30 17:08:35 +02003603 if (WARN(status->rate_idx > 76,
Johannes Bergfc885182010-07-30 13:23:12 +02003604 "Rate marked as an HT rate but passed "
3605 "status->rate_idx is not "
3606 "an MCS index [0-76]: %d (0x%02x)\n",
3607 status->rate_idx,
3608 status->rate_idx))
3609 goto drop;
Johannes Berg56146182012-11-09 15:07:02 +01003610 } else if (status->flag & RX_FLAG_VHT) {
3611 if (WARN_ONCE(status->rate_idx > 9 ||
3612 !status->vht_nss ||
3613 status->vht_nss > 8,
3614 "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
3615 status->rate_idx, status->vht_nss))
3616 goto drop;
Johannes Bergfc885182010-07-30 13:23:12 +02003617 } else {
Johannes Berg444e38032012-09-30 17:08:35 +02003618 if (WARN_ON(status->rate_idx >= sband->n_bitrates))
Johannes Bergfc885182010-07-30 13:23:12 +02003619 goto drop;
3620 rate = &sband->bitrates[status->rate_idx];
3621 }
Jouni Malinen0fb8ca42008-12-12 14:38:33 +02003622 }
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003623
Johannes Berg554891e2010-09-24 12:38:25 +02003624 status->rx_flags = 0;
3625
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003626 /*
3627 * key references and virtual interfaces are protected using RCU
3628 * and this requires that we are in a read-side RCU section during
3629 * receive processing
3630 */
3631 rcu_read_lock();
3632
3633 /*
3634 * Frames with failed FCS/PLCP checksum are not returned,
3635 * all other frames are returned without radiotap header
3636 * if it was previously present.
3637 * Also, frames with less than 16 bytes are dropped.
3638 */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003639 skb = ieee80211_rx_monitor(local, skb, rate);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003640 if (!skb) {
3641 rcu_read_unlock();
3642 return;
3643 }
3644
Johannes Berge1e54062010-11-30 08:58:45 +01003645 ieee80211_tpt_led_trig_rx(local,
3646 ((struct ieee80211_hdr *)skb->data)->frame_control,
3647 skb->len);
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003648 __ieee80211_rx_handle_packet(hw, skb, napi);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003649
3650 rcu_read_unlock();
Johannes Berg77a980d2009-08-24 11:46:30 +02003651
3652 return;
3653 drop:
3654 kfree_skb(skb);
Ron Rindjunsky6368e4b2007-12-24 13:36:39 +02003655}
Johannes Bergaf9f9b22015-06-11 16:02:32 +02003656EXPORT_SYMBOL(ieee80211_rx_napi);
Johannes Berg571ecf62007-07-27 15:43:22 +02003657
3658/* This is a version of the rx handler that can be called from hard irq
3659 * context. Post the skb on the queue and schedule the tasklet */
Johannes Bergf1d58c22009-06-17 13:13:00 +02003660void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb)
Johannes Berg571ecf62007-07-27 15:43:22 +02003661{
3662 struct ieee80211_local *local = hw_to_local(hw);
3663
3664 BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb));
3665
Johannes Berg571ecf62007-07-27 15:43:22 +02003666 skb->pkt_type = IEEE80211_RX_MSG;
3667 skb_queue_tail(&local->skb_queue, skb);
3668 tasklet_schedule(&local->tasklet);
3669}
3670EXPORT_SYMBOL(ieee80211_rx_irqsafe);